diff --git a/backup/moodle2/backup_mediagallery_stepslib.php b/backup/moodle2/backup_mediagallery_stepslib.php
index 0e524e1..87bef1a 100644
--- a/backup/moodle2/backup_mediagallery_stepslib.php
+++ b/backup/moodle2/backup_mediagallery_stepslib.php
@@ -32,6 +32,7 @@ protected function define_structure() {
 
         // To know if we are including userinfo.
         $userinfo = $this->get_setting_value('userinfo');
+        $includecomments = $this->get_setting_value('comments');
 
         // Define each element separated.
         $mediagallery = new backup_nested_element('mediagallery', array('id'), array(
@@ -40,7 +41,9 @@ protected function define_structure() {
             'captionposition', 'galleryfocus', 'carousel', 'grid', 'gridrows',
             'gridcolumns', 'enforcedefaults', 'readonlyfrom', 'readonlyto',
             'maxbytes', 'maxitems', 'maxgalleries', 'allowcomments', 'allowlikes',
-            'colltype', 'objectid', 'source', 'mode', 'creator', 'userid',
+            'colltype',
+            'completiongalleries', 'completionitems', 'completioncomments',
+            'objectid', 'source', 'mode', 'creator', 'userid',
         ));
 
         $userfeedbacks = new backup_nested_element('userfeedback');
@@ -63,6 +66,16 @@ protected function define_structure() {
             'timecreated', 'broadcaster', 'objectid', 'source', 'processing_status', 'creator',
         ));
 
+        $gcomments = new backup_nested_element('gallerycomments');
+        $gcomment = new backup_nested_element('gallerycomment', ['id'], [
+            'contextid', 'component', 'commentarea', 'itemid', 'content', 'format', 'userid', 'timecreated',
+        ]);
+
+        $icomments = new backup_nested_element('itemcomments');
+        $icomment = new backup_nested_element('itemcomment', ['id'], [
+            'contextid', 'component', 'commentarea', 'itemid', 'content', 'format', 'userid', 'timecreated',
+        ]);
+
         $ctags = new backup_nested_element('collectiontags');
         $ctag = new backup_nested_element('collectiontag', array('id'), array('itemid', 'rawname'));
 
@@ -80,12 +93,16 @@ protected function define_structure() {
 
         $gallerys->add_child($gallery);
         $gallery->add_child($items);
+        $gallery->add_child($gcomments);
+        $gcomments->add_child($gcomment);
         $gallery->add_child($gtags);
         $gtags->add_child($gtag);
 
         $items->add_child($item);
         $userfeedbacks->add_child($userfeedback);
         $item->add_child($userfeedbacks);
+        $item->add_child($icomments);
+        $icomments->add_child($icomment);
         $item->add_child($itags);
         $itags->add_child($itag);
 
@@ -98,6 +115,17 @@ protected function define_structure() {
             $item->set_source_table('mediagallery_item', array('galleryid' => backup::VAR_PARENTID));
             $userfeedback->set_source_table('mediagallery_userfeedback', array('itemid' => backup::VAR_PARENTID));
 
+            if ($includecomments) {
+                $gcomment->set_source_table('comments', [
+                                                        'contextid' => backup::VAR_CONTEXTID,
+                                                        'commentarea' => backup_helper::is_sqlparam('gallery'),
+                                                        'itemid' => backup::VAR_PARENTID]);
+                $icomment->set_source_table('comments', [
+                                                        'contextid' => backup::VAR_CONTEXTID,
+                                                        'commentarea' => backup_helper::is_sqlparam('item'),
+                                                        'itemid' => backup::VAR_PARENTID]);
+            }
+
             if (core_tag_tag::is_enabled('mod_mediagallery', 'mediagallery')) {
                 $ctag->set_source_sql('SELECT t.id, ti.itemid, t.rawname
                                 FROM {tag} t
@@ -144,6 +172,9 @@ protected function define_structure() {
         $gallery->annotate_ids('user', 'userid');
         $item->annotate_ids('user', 'userid');
 
+        $gcomment->annotate_ids('user', 'userid');
+        $icomment->annotate_ids('user', 'userid');
+
         // Return the root element (mediagallery), wrapped into standard activity structure.
         return $this->prepare_activity_structure($mediagallery);
     }
diff --git a/backup/moodle2/restore_mediagallery_stepslib.php b/backup/moodle2/restore_mediagallery_stepslib.php
index 446e16a..eea213a 100644
--- a/backup/moodle2/restore_mediagallery_stepslib.php
+++ b/backup/moodle2/restore_mediagallery_stepslib.php
@@ -36,6 +36,7 @@ protected function define_structure() {
 
         $paths = array();
         $userinfo = $this->get_setting_value('userinfo');
+        $includecomments = $this->get_setting_value('comments');
 
         $mediagallery = new restore_path_element('mediagallery', '/activity/mediagallery');
         $paths[] = $mediagallery;
@@ -51,6 +52,13 @@ protected function define_structure() {
                 '/activity/mediagallery/gallerys/gallery/items/item/userfeedback/feedback');
             $paths[] = $userfeedback;
 
+            if ($includecomments) {
+                $paths[] = new restore_path_element('mediagallery_gcomment',
+                    '/activity/mediagallery/gallerys/gallery/gallerycomments/gallerycomment');
+                $paths[] = new restore_path_element('mediagallery_icomment',
+                    '/activity/mediagallery/gallerys/gallery/items/item/itemcomments/itemcomment');
+            }
+
             $paths[] = new restore_path_element('mediagallery_ctag', '/activity/mediagallery/collectiontags/collectiontag');
             $paths[] = new restore_path_element('mediagallery_gtag',
                                                 '/activity/mediagallery/gallerys/gallery/gallerytags/gallerytag');
@@ -127,6 +135,46 @@ protected function process_mediagallery_item($data) {
         $this->set_mapping('mediagallery_item', $oldid, $newitemid, true);
     }
 
+    /**
+     * Process a gallery comment.
+     *
+     * @param object|array $data
+     * @return void
+     */
+    protected function process_mediagallery_gcomment($data): void {
+        global $DB;
+
+        $data = (object)$data;
+        $oldid = $data->id;
+
+        $data->itemid = $this->get_new_parentid('mediagallery_gallery');
+        $data->timecreated = $this->apply_date_offset($data->timecreated);
+        $data->userid = $this->get_mappingid('user', $data->userid);
+        $data->contextid = $this->get_mappingid('context', $data->contextid);
+        $newcommentid = $DB->insert_record('comments', $data);
+        $this->set_mapping('comments', $oldid, $newcommentid, true);
+    }
+
+    /**
+     * Process an item comment.
+     *
+     * @param object|array $data
+     * @return void
+     */
+    protected function process_mediagallery_icomment($data): void {
+        global $DB;
+
+        $data = (object)$data;
+        $oldid = $data->id;
+
+        $data->itemid = $this->get_new_parentid('mediagallery_item');
+        $data->timecreated = $this->apply_date_offset($data->timecreated);
+        $data->userid = $this->get_mappingid('user', $data->userid);
+        $data->contextid = $this->get_mappingid('context', $data->contextid);
+        $newcommentid = $DB->insert_record('comments', $data);
+        $this->set_mapping('comments', $oldid, $newcommentid, true);
+    }
+
     protected function process_mediagallery_ctag($data) {
         $data = (object)$data;
         if (!core_tag_tag::is_enabled('mod_mediagallery', 'mediagallery')) {
diff --git a/classes/completion/custom_completion.php b/classes/completion/custom_completion.php
new file mode 100644
index 0000000..7e26d03
--- /dev/null
+++ b/classes/completion/custom_completion.php
@@ -0,0 +1,128 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+declare(strict_types=1);
+
+namespace mod_mediagallery\completion;
+
+use core_completion\activity_custom_completion;
+
+/**
+ * Activity custom completion subclass for the Media collection activity.
+ *
+ * Class for defining mod_mediagallery's custom completion rules and fetching the completion statuses
+ * of the custom completion rules for a given Media collection instance and a user.
+ *
+ * @package   mod_mediagallery
+ * @copyright 2023 Otago Polytechnic
+ * @author    James Calder
+ * @copyright based on work by Simey Lameze <simey@moodle.com>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class custom_completion extends activity_custom_completion {
+
+    /**
+     * Fetches the completion state for a given completion rule.
+     *
+     * @param string $rule The completion rule.
+     * @return int The completion state.
+     */
+    public function get_state(string $rule): int {
+        global $DB;
+
+        $this->validate_rule($rule);
+
+        $userid = $this->userid;
+        $collectionid = $this->cm->instance;
+
+        if (!$collection = $DB->get_record('mediagallery', ['id' => $collectionid])) {
+            throw new \moodle_exception('Unable to find Media collection with id ' . $collectionid);
+        }
+
+        $itemcountparams = ['collectionid' => $collectionid, 'userid' => $userid];
+        $itemcountsql =
+           "SELECT COUNT(*)
+            FROM {mediagallery_item} mgi
+            JOIN {mediagallery_gallery} mgg ON mgg.id = mgi.galleryid
+            WHERE mgg.instanceid = :collectionid AND mgi.userid = :userid";
+
+        $commentcountparams = ['collectionid' => $collectionid, 'userid' => $userid];
+        $commentcountsql =
+           "SELECT COUNT(*)
+            FROM {comments} c
+            LEFT JOIN {mediagallery_item} mgi
+                ON c.component = 'mod_mediagallery' AND c.commentarea = 'item' AND mgi.id = c.itemid
+            JOIN {mediagallery_gallery} mgg ON c.component = 'mod_mediagallery'
+                AND (c.commentarea = 'gallery' AND mgg.id = c.itemid
+                    OR c.commentarea = 'item' AND mgg.id = mgi.galleryid)
+            WHERE c.component = 'mod_mediagallery' AND mgg.instanceid = :collectionid AND c.userid = :userid";
+
+        if ($rule == 'completiongalleries') {
+            $status = $collection->completiongalleries <=
+                $DB->count_records('mediagallery_gallery', ['instanceid' => $collectionid, 'userid' => $userid]);
+        } else if ($rule == 'completionitems') {
+            $status = $collection->completionitems <= $DB->get_field_sql($itemcountsql, $itemcountparams);
+        } else if ($rule == 'completioncomments') {
+            $status = $collection->completioncomments <= $DB->get_field_sql($commentcountsql, $commentcountparams);
+        }
+
+        return $status ? COMPLETION_COMPLETE : COMPLETION_INCOMPLETE;
+    }
+
+    /**
+     * Fetch the list of custom completion rules that this module defines.
+     *
+     * @return string[]
+     */
+    public static function get_defined_custom_rules(): array {
+        return [
+            'completiongalleries',
+            'completionitems',
+            'completioncomments',
+        ];
+    }
+
+    /**
+     * Returns an associative array of the descriptions of custom completion rules.
+     *
+     * @return string[]
+     */
+    public function get_custom_rule_descriptions(): array {
+        $completiongalleries = $this->cm->customdata['customcompletionrules']['completiongalleries'] ?? 0;
+        $completionitems = $this->cm->customdata['customcompletionrules']['completionitems'] ?? 0;
+        $completioncomments = $this->cm->customdata['customcompletionrules']['completioncomments'] ?? 0;
+
+        return [
+            'completiongalleries' => get_string('completiondetail:galleries', 'mediagallery', $completiongalleries),
+            'completionitems' => get_string('completiondetail:items', 'mediagallery', $completionitems),
+            'completioncomments' => get_string('completiondetail:comments', 'mediagallery', $completioncomments),
+        ];
+    }
+
+    /**
+     * Returns an array of all completion rules, in the order they should be displayed to users.
+     *
+     * @return string[]
+     */
+    public function get_sort_order(): array {
+        return [
+            'completionview',
+            'completiongalleries',
+            'completionitems',
+            'completioncomments',
+        ];
+    }
+}
diff --git a/classes/event/comment_created.php b/classes/event/comment_created.php
new file mode 100644
index 0000000..d07b390
--- /dev/null
+++ b/classes/event/comment_created.php
@@ -0,0 +1,50 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * The mod_mediagallery comment created event.
+ *
+ * @package    mod_mediagallery
+ * @copyright  2023 Otago Polytechnic
+ * @author     James Calder
+ * @copyright  based on work by 2013 Rajesh Taneja <rajesh@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace mod_mediagallery\event;
+
+/**
+ * The mod_mediagallery comment created event class.
+ *
+ * @package    mod_mediagallery
+ * @copyright  2023 Otago Polytechnic
+ * @author     James Calder
+ * @copyright  based on work by 2013 Rajesh Taneja <rajesh@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class comment_created extends \core\event\comment_created {
+
+    /**
+     * Returns description of what happened.
+     *
+     * @return string
+     */
+    public function get_description(): string {
+        return "The user with id '$this->userid' added the comment with id '$this->objectid' " .
+            "to the Media collection activity with course module id '$this->contextinstanceid'.";
+    }
+
+}
diff --git a/classes/event/comment_deleted.php b/classes/event/comment_deleted.php
new file mode 100644
index 0000000..5aec1b5
--- /dev/null
+++ b/classes/event/comment_deleted.php
@@ -0,0 +1,50 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * The mod_mediagallery comment deleted event.
+ *
+ * @package    mod_mediagallery
+ * @copyright  2023 Otago Polytechnic
+ * @author     James Calder
+ * @copyright  based on work by 2013 Rajesh Taneja <rajesh@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace mod_mediagallery\event;
+
+/**
+ * The mod_mediagallery comment deleted event class.
+ *
+ * @package    mod_mediagallery
+ * @copyright  2023 Otago Polytechnic
+ * @author     James Calder
+ * @copyright  based on work by 2013 Rajesh Taneja <rajesh@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class comment_deleted extends \core\event\comment_deleted {
+
+    /**
+     * Returns description of what happened.
+     *
+     * @return string
+     */
+    public function get_description(): string {
+        return "The user with id '$this->userid' deleted the comment with id '$this->objectid' " .
+            "from the Media collection activity with course module id '$this->contextinstanceid'.";
+    }
+
+}
diff --git a/classes/gallery.php b/classes/gallery.php
index 7225efa..fe0c82c 100644
--- a/classes/gallery.php
+++ b/classes/gallery.php
@@ -81,23 +81,39 @@ public function copy($targetid) {
         $newgalleryrecord->userid = $USER->id;
         $newgalleryrecord->groupid = 0;
 
-        $newgallery = self::create($newgalleryrecord);
+        $newgallery = self::create($newgalleryrecord, ['nocompletionupdate' => true]);
+        $completionupdateuserids = [];
+        if ($newgallery->record->userid) {
+            $completionupdateuserids[$newgallery->record->userid] = true;
+        }
 
         $thumbnail = 0;
         foreach ($this->get_items() as $item) {
-            $newitem = $item->copy($newgallery->id);
+            $newitem = $item->copy($newgallery->id, ['nocompletionupdate' => true]);
             if ($item->id == $newgallery->thumbnail) {
                 $thumbnail = $newitem->id;
             }
+            if ($newitem->record->userid) {
+                $completionupdateuserids[$newitem->record->userid] = true;
+            }
         }
 
         // Update thumbnail.
         $DB->set_field('mediagallery_gallery', 'thumbnail', $thumbnail, array('id' => $newgallery->id));
 
+        // Update completion state.
+        $cm = get_coursemodule_from_instance('mediagallery', $newgallery->record->instanceid);
+        $completion = new \completion_info(get_course($cm->course));
+        if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+            foreach ($completionupdateuserids as $userid => $needschange) {
+                $completion->update_state($cm, COMPLETION_COMPLETE, $userid);
+            }
+        }
+
         return true;
     }
 
-    public static function create(\stdClass $data) {
+    public static function create(\stdClass $data, array $options = []) {
         if ($data->mode == 'youtube') {
             $data->galleryfocus = self::TYPE_VIDEO;
         }
@@ -106,6 +122,15 @@ public static function create(\stdClass $data) {
         }
         $result = parent::create($data);
 
+        // Update completion state.
+        if (empty($options['nocompletionupdate']) && $result->record->userid) {
+            $cm = get_coursemodule_from_instance('mediagallery', $result->record->instanceid);
+            $completion = new \completion_info(get_course($cm->course));
+            if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+                $completion->update_state($cm, COMPLETION_COMPLETE, $result->record->userid);
+            }
+        }
+
         $params = array(
             'context' => $result->get_collection()->context,
             'objectid' => $result->id,
@@ -138,12 +163,43 @@ public function delete($options = array()) {
         $event->add_record_snapshot('mediagallery_gallery', $this->record);
         $event->trigger();
 
+        // Get users for completion update.
+        $completionupdateparams = ['galleryid1' => $this->record->id, 'galleryid2' => $this->record->id,
+                                    'galleryid3' => $this->record->id, 'galleryid4' => $this->record->id];
+        $completionupdatesql =
+           "   (SELECT DISTINCT mgg.userid
+                FROM {mediagallery_gallery} mgg
+                WHERE mgg.id = :galleryid1 AND mgg.userid <> 0)
+            UNION
+               (SELECT DISTINCT mgi.userid
+                FROM {mediagallery_item} mgi
+                WHERE mgi.galleryid = :galleryid2 AND mgi.userid <> 0)
+            UNION
+               (SELECT DISTINCT c.userid
+                FROM {comments} c
+                LEFT JOIN {mediagallery_item} mgi
+                    ON c.component = 'mod_mediagallery' AND c.commentarea = 'item' AND mgi.id = c.itemid
+                WHERE c.component = 'mod_mediagallery'
+                    AND (c.commentarea = 'gallery' AND c.itemid = :galleryid3
+                        OR c.commentarea = 'item' AND mgi.galleryid = :galleryid4)
+                    AND c.userid <> 0)";
+        $completionupdateuserids = $DB->get_fieldset_sql($completionupdatesql, $completionupdateparams);
+
         // Delete all items and then the gallery.
         item::delete_all_by_gallery($this->record->id);
         \comment::delete_comments(array('commentarea' => 'gallery', 'itemid' => $this->record->id));
 
         parent::delete();
 
+        // Update completion state.
+        $cm = get_coursemodule_from_instance('mediagallery', $this->record->instanceid);
+        $completion = new \completion_info(get_course($cm->course));
+        if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+            foreach ($completionupdateuserids as $userid) {
+                $completion->update_state($cm, COMPLETION_INCOMPLETE, $userid);
+            }
+        }
+
         return true;
     }
 
diff --git a/classes/item.php b/classes/item.php
index 8a5c114..84331e3 100644
--- a/classes/item.php
+++ b/classes/item.php
@@ -67,12 +67,12 @@ public function __construct($recordorid, $options = array()) {
         }
     }
 
-    public function copy($targetid) {
+    public function copy($targetid, array $options = []) {
         $newitemrecord = clone $this->record;
         unset($newitemrecord->id);
         $newitemrecord->galleryid = $targetid;
 
-        $newitem = self::create($newitemrecord);
+        $newitem = self::create($newitemrecord, ['nocompletionupdate' => true]);
 
         $fs = get_file_storage();
         if ($file = $this->get_file()) { // Item.
@@ -96,10 +96,21 @@ public function copy($targetid) {
             );
             $fs->create_file_from_storedfile($fileinfo, $file);
         }
+
+        // Update completion state.
+        if (empty($options['nocompletionupdate']) && $newitem->record->userid) {
+            $gallery = $newitem->gallery ?? new gallery($newitem->record->galleryid);
+            $cm = get_coursemodule_from_instance('mediagallery', $gallery->record->instanceid);
+            $completion = new \completion_info(get_course($cm->course));
+            if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+                $completion->update_state($cm, COMPLETION_COMPLETE, $newitem->record->userid);
+            }
+        }
+
         return $newitem;
     }
 
-    public static function create(\stdClass $data) {
+    public static function create(\stdClass $data, array $options = []) {
         global $DB, $USER;
         foreach (static::$defaultvalues as $key => $val) {
             if (!isset($data->$key)) {
@@ -118,6 +129,16 @@ public static function create(\stdClass $data) {
             $DB->execute($sql, array('item' => $result->id, 'galleryid' => $result->galleryid));
         }
 
+        // Update completion state.
+        if (empty($options['nocompletionupdate']) && $result->record->userid) {
+            $gallery = $result->gallery ?? new gallery($result->record->galleryid);
+            $cm = get_coursemodule_from_instance('mediagallery', $gallery->record->instanceid);
+            $completion = new \completion_info(get_course($cm->course));
+            if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+                $completion->update_state($cm, COMPLETION_COMPLETE, $result->record->userid);
+            }
+        }
+
         $params = array(
             'context' => $result->get_context(),
             'objectid' => $result->id,
@@ -133,7 +154,7 @@ public static function create(\stdClass $data) {
     }
 
     public static function create_from_archive(gallery $gallery, \stored_file $storedfile, $formdata = array()) {
-        global $DB;
+        global $DB, $USER;
         $context = $gallery->get_collection()->context;
 
         $maxitems = $gallery->get_collection()->maxitems;
@@ -182,7 +203,7 @@ public static function create_from_archive(gallery $gallery, \stored_file $store
                 $data->thumbnail = 1;
                 $count = 0;
             }
-            $item = self::create($data);
+            $item = self::create($data, ['nocompletionupdate' => true]);
 
             // Copy the file into the correct area.
             $fileinfo = array(
@@ -201,6 +222,16 @@ public static function create_from_archive(gallery $gallery, \stored_file $store
             $count++;
         }
         $fs->delete_area_files($context->id, 'mod_mediagallery', 'unpacktemp', 0);
+
+        // Update completion state.
+        if ($USER->id) {
+            $cm = get_coursemodule_from_instance('mediagallery', $gallery->record->instanceid);
+            $completion = new \completion_info(get_course($cm->course));
+            if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+                $completion->update_state($cm, COMPLETION_COMPLETE, $USER->id);
+            }
+        }
+
     }
 
     /**
@@ -223,6 +254,19 @@ public function delete($options = array()) {
         $event->add_record_snapshot('mediagallery_item', $this->record);
         $event->trigger();
 
+        // Get users for completion update.
+        $completionupdateparams = ['itemid1' => $this->record->id, 'itemid2' => $this->record->id];
+        $completionupdatesql =
+           "   (SELECT DISTINCT mgi.userid
+                FROM {mediagallery_item} mgi
+                WHERE mgi.id = :itemid1 AND mgi.userid <> 0)
+            UNION
+               (SELECT DISTINCT c.userid
+                FROM {comments} c
+                WHERE c.component = 'mod_mediagallery' AND c.commentarea = 'item' AND c.itemid = :itemid2
+                    AND c.userid <> 0)";
+        $completionupdateuserids = $DB->get_fieldset_sql($completionupdatesql, $completionupdateparams);
+
         $fs = get_file_storage();
         $fs->delete_area_files($this->get_context()->id, 'mod_mediagallery', 'item', $this->record->id);
         $fs->delete_area_files($this->get_context()->id, 'mod_mediagallery', 'lowres', $this->record->id);
@@ -231,7 +275,21 @@ public function delete($options = array()) {
         $DB->delete_records('mediagallery_userfeedback', array('itemid' => $this->record->id));
         \comment::delete_comments(array('commentarea' => 'item', 'itemid' => $this->record->id));
 
-        return parent::delete();
+        $result = parent::delete();
+
+        // Update completion state.
+        if (empty($options['nocompletionupdate'])) {
+            $gallery = $this->gallery ?? new gallery($this->record->galleryid);
+            $cm = get_coursemodule_from_instance('mediagallery', $gallery->record->instanceid);
+            $completion = new \completion_info(get_course($cm->course));
+            if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+                foreach ($completionupdateuserids as $userid) {
+                    $completion->update_state($cm, COMPLETION_INCOMPLETE, $userid);
+                }
+            }
+        }
+
+        return $result;
     }
 
     public static function delete_all_by_gallery($galleryid) {
@@ -259,6 +317,10 @@ public static function delete_all_by_gallery($galleryid) {
                 )";
         $DB->execute($sql, array('galleryid' => $galleryid));
         $DB->delete_records('mediagallery_item', array('galleryid' => $galleryid));
+
+        // We don't need to update completion state here,
+        // because this function is only called from gallery::delete, which takes care of it.
+
         return true;
     }
 
diff --git a/classes/observers.php b/classes/observers.php
new file mode 100644
index 0000000..c306559
--- /dev/null
+++ b/classes/observers.php
@@ -0,0 +1,74 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Event observers.
+ *
+ * @package    mod_mediagallery
+ * @copyright  2023 Otago Polytechnic
+ * @author     James Calder
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace mod_mediagallery;
+
+/**
+ * Event observers.
+ *
+ * @package    mod_mediagallery
+ * @copyright  2023 Otago Polytechnic
+ * @author     James Calder
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class observers {
+
+    // TODO: Ignore if course reset in progress?
+
+    /**
+     * A comment was created.
+     *
+     * @param \core\event\base $event The event.
+     * @return void
+     */
+    public static function comment_created($event): void {
+        // Update completion state.
+        if ($event->userid) {
+            $cm = get_coursemodule_from_id('mediagallery', $event->contextinstanceid);
+            $completion = new \completion_info(get_course($cm->course));
+            if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+                $completion->update_state($cm, COMPLETION_COMPLETE, $event->userid);
+            }
+        }
+    }
+
+    /**
+     * A comment was deleted.
+     *
+     * @param \core\event\base $event The event.
+     * @return void
+     */
+    public static function comment_deleted($event): void {
+        // Update completion state.
+        if ($event->userid) {
+            $cm = get_coursemodule_from_id('mediagallery', $event->contextinstanceid);
+            $completion = new \completion_info(get_course($cm->course));
+            if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+                $completion->update_state($cm, COMPLETION_INCOMPLETE, $event->userid);
+            }
+        }
+    }
+
+}
diff --git a/classes/privacy/provider.php b/classes/privacy/provider.php
index 15e03a2..a96508f 100644
--- a/classes/privacy/provider.php
+++ b/classes/privacy/provider.php
@@ -332,7 +332,8 @@ protected static function export_item_data(int $userid, \context $context, $gall
      * @param \context $context the context to delete in.
      */
     public static function delete_data_for_all_users_in_context(\context $context) {
-        global $DB;
+        global $CFG, $DB;
+        require_once($CFG->libdir . '/completionlib.php');
 
         if (!$context instanceof \context_module) {
             return;
@@ -340,6 +341,29 @@ public static function delete_data_for_all_users_in_context(\context $context) {
 
         $instanceid = $DB->get_field('course_modules', 'instance', ['id' => $context->instanceid], MUST_EXIST);
 
+        // Get users for completion update.
+        $completionupdateparams = ['instanceid1' => $instanceid, 'instanceid2' => $instanceid, 'instanceid3' => $instanceid];
+        $completionupdatesql =
+           "   (SELECT DISTINCT mgg.userid
+                FROM {mediagallery_gallery} mgg
+                WHERE mgg.instanceid = :instanceid1 AND mgg.userid <> 0)
+            UNION
+               (SELECT DISTINCT mgi.userid
+                FROM {mediagallery_item} mgi
+                JOIN {mediagallery_gallery} mgg ON mgg.id = mgi.galleryid
+                WHERE mgg.instanceid = :instanceid2 AND mgi.userid <> 0)
+            UNION
+               (SELECT DISTINCT c.userid
+                FROM {comments} c
+                LEFT JOIN {mediagallery_item} mgi
+                    ON c.component = 'mod_mediagallery' AND c.commentarea = 'item' AND mgi.id = c.itemid
+                JOIN {mediagallery_gallery} mgg
+                    ON c.component = 'mod_mediagallery'
+                        AND (c.commentarea = 'gallery' AND mgg.id = c.itemid
+                            OR c.commentarea = 'item' AND mgg.id = mgi.galleryid)
+                WHERE c.component = 'mod_mediagallery' AND mgg.instanceid = :instanceid3 AND c.userid <> 0)";
+        $completionupdateuserids = $DB->get_fieldset_sql($completionupdatesql, $completionupdateparams);
+
         $DB->delete_records_select('mediagallery_userfeedback',
             "itemid IN (
                 SELECT i.id
@@ -367,6 +391,15 @@ public static function delete_data_for_all_users_in_context(\context $context) {
 
         \core_tag\privacy\provider::delete_item_tags($context, 'mod_mediagallery', 'mediagallery_gallery');
         \core_tag\privacy\provider::delete_item_tags($context, 'mod_mediagallery', 'mediagallery_item');
+
+        // Update completion state.
+        $cm = get_coursemodule_from_instance('mediagallery', $instanceid);
+        $completion = new \completion_info(get_course($cm->course));
+        if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+            foreach ($completionupdateuserids as $userid) {
+                $completion->update_state($cm, COMPLETION_INCOMPLETE, $userid);
+            }
+        }
     }
 
     /**
@@ -375,7 +408,8 @@ public static function delete_data_for_all_users_in_context(\context $context) {
      * @param approved_contextlist $contextlist a list of contexts approved for deletion.
      */
     public static function delete_data_for_user(approved_contextlist $contextlist) {
-        global $DB;
+        global $CFG, $DB;
+        require_once($CFG->libdir . '/completionlib.php');
 
         if (empty($contextlist->count())) {
             return;
@@ -384,6 +418,26 @@ public static function delete_data_for_user(approved_contextlist $contextlist) {
         $userid = $contextlist->get_user()->id;
         $fs = get_file_storage();
 
+        $completionupdatesql =
+           "   (SELECT DISTINCT mgg.userid
+                FROM {mediagallery_gallery} mgg
+                WHERE mgg.instanceid = :instanceid1 AND mgg.userid = :guserid)
+            UNION
+               (SELECT DISTINCT mgi.userid
+                FROM {mediagallery_item} mgi
+                JOIN {mediagallery_gallery} mgg ON mgg.id = mgi.galleryid
+                WHERE mgg.instanceid = :instanceid2 AND (mgg.userid = :guserid2 OR mgi.userid = :iuserid))
+            UNION
+               (SELECT DISTINCT c.userid
+                FROM {comments} c
+                LEFT JOIN {mediagallery_item} mgi
+                    ON c.component = 'mod_mediagallery' AND c.commentarea = 'item' AND mgi.id = c.itemid
+                JOIN {mediagallery_gallery} mgg
+                    ON c.component = 'mod_mediagallery'
+                        AND (c.commentarea = 'gallery' AND mgg.id = c.itemid
+                            OR c.commentarea = 'item' AND mgg.id = mgi.galleryid)
+                WHERE c.component = 'mod_mediagallery' AND mgg.instanceid = :instanceid3
+                    AND (mgg.userid = :guserid3 OR mgi.userid = :iuserid2 OR c.userid = :cuserid))";
         $galleryidsql = "SELECT g.id
                          FROM {mediagallery_gallery} g
                          WHERE userid = :userid AND instanceid = :instanceid";
@@ -400,6 +454,14 @@ public static function delete_data_for_user(approved_contextlist $contextlist) {
             }
             $instanceid = $DB->get_field('course_modules', 'instance', ['id' => $context->instanceid], MUST_EXIST);
 
+            // Get users for completion update.
+            $completionupdateparams = [
+                'instanceid1' => $instanceid, 'guserid' => $userid,
+                'instanceid2' => $instanceid, 'guserid2' => $userid, 'iuserid' => $userid,
+                'instanceid3' => $instanceid, 'guserid3' => $userid, 'iuserid2' => $userid, 'cuserid' => $userid,
+            ];
+            $completionupdateuserids = $DB->get_fieldset_sql($completionupdatesql, $completionupdateparams);
+
             $params = [
                 'userid' => $userid,
                 'instanceid' => $instanceid,
@@ -414,15 +476,27 @@ public static function delete_data_for_user(approved_contextlist $contextlist) {
             \core_tag\privacy\provider::delete_item_tags_select($context, 'mod_mediagallery', 'item',
                 "IN ($itemidsql)", $params);
 
+            $singlecontextlist = new approved_contextlist($contextlist->get_user(), 'mod_mediagallery', [$context->id]);
+            \core_comment\privacy\provider::delete_comments_for_user($singlecontextlist, 'mod_mediagallery', 'gallery');
+            \core_comment\privacy\provider::delete_comments_for_user($singlecontextlist, 'mod_mediagallery', 'item');
+
             // We delete these last as the deletes above depend on these records.
 
             $DB->delete_records_select('mediagallery_userfeedback', "itemid IN ($itemidsql)", $params);
             $DB->delete_records_select('mediagallery_item', "galleryid IN ($galleryidsql)", $params);
             $DB->delete_records('mediagallery_gallery', $params);
-        }
 
-        \core_comment\privacy\provider::delete_comments_for_user($contextlist, 'mod_mediagallery', 'gallery');
-        \core_comment\privacy\provider::delete_comments_for_user($contextlist, 'mod_mediagallery', 'item');
+            // Update completion state.
+            // TODO: Test.
+            $cm = get_coursemodule_from_instance('mediagallery', $instanceid);
+            $completion = new \completion_info(get_course($cm->course));
+            if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+                foreach ($completionupdateuserids as $completionupdateuserid) {
+                    $completion->update_state($cm, COMPLETION_INCOMPLETE, $completionupdateuserid);
+                }
+            }
+
+        }
 
     }
 
@@ -482,7 +556,8 @@ public static function get_users_in_context(userlist $userlist) {
      * @param approved_userlist $userlist The approved context and user information to delete information for.
      */
     public static function delete_data_for_users(approved_userlist $userlist) {
-        global $DB;
+        global $CFG, $DB;
+        require_once($CFG->libdir . '/completionlib.php');
 
         $context = $userlist->get_context();
         if ($context->contextlevel != CONTEXT_MODULE) {
@@ -496,6 +571,40 @@ public static function delete_data_for_users(approved_userlist $userlist) {
         }
 
         list($insql, $inparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED);
+        list($ginsql, $ginparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'guserid');
+        list($ginsql2, $ginparams2) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'guserid2');
+        list($ginsql3, $ginparams3) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'guserid3');
+        list($iinsql, $iinparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'iuserid');
+        list($iinsql2, $iinparams2) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'iuserid2');
+        list($cinsql, $cinparams) = $DB->get_in_or_equal($userids, SQL_PARAMS_NAMED, 'cuserid');
+
+        // Get users for completion update.
+        $completionupdateparams = array_merge(
+            ['instanceid1' => $instanceid], $ginparams,
+            ['instanceid2' => $instanceid], $ginparams2, $iinparams,
+            ['instanceid3' => $instanceid], $ginparams3, $iinparams2, $cinparams
+        );
+        $completionupdatesql =
+        "   (SELECT DISTINCT mgg.userid
+             FROM {mediagallery_gallery} mgg
+             WHERE mgg.instanceid = :instanceid1 AND mgg.userid $ginsql)
+         UNION
+            (SELECT DISTINCT mgi.userid
+             FROM {mediagallery_item} mgi
+             JOIN {mediagallery_gallery} mgg ON mgg.id = mgi.galleryid
+             WHERE mgg.instanceid = :instanceid2 AND (mgg.userid $ginsql2 OR mgi.userid $iinsql))
+         UNION
+            (SELECT DISTINCT c.userid
+             FROM {comments} c
+             LEFT JOIN {mediagallery_item} mgi
+                 ON c.component = 'mod_mediagallery' AND c.commentarea = 'item' AND mgi.id = c.itemid
+             JOIN {mediagallery_gallery} mgg
+                 ON c.component = 'mod_mediagallery'
+                     AND (c.commentarea = 'gallery' AND mgg.id = c.itemid
+                         OR c.commentarea = 'item' AND mgg.id = mgi.galleryid)
+             WHERE c.component = 'mod_mediagallery' AND mgg.instanceid = :instanceid3
+                AND (mgg.userid $ginsql3 OR mgi.userid $iinsql2 OR c.userid $cinsql))";
+        $completionupdateuserids = $DB->get_fieldset_sql($completionupdatesql, $completionupdateparams);
 
         $fs = get_file_storage();
 
@@ -525,10 +634,20 @@ public static function delete_data_for_users(approved_userlist $userlist) {
 
         $DB->delete_records_select('mediagallery_userfeedback', "itemid IN ($itemidsql)", $params);
         $DB->delete_records_select('mediagallery_item', "galleryid IN ($galleryidsql)", $params);
-        $DB->delete_records('mediagallery_gallery', $params);
+        $DB->delete_records_select('mediagallery_gallery', "userid $insql AND instanceid = :instanceid", $params);
 
         \core_comment\privacy\provider::delete_comments_for_users($userlist, 'mod_mediagallery', 'gallery');
         \core_comment\privacy\provider::delete_comments_for_users($userlist, 'mod_mediagallery', 'item');
+
+        // Update completion state.
+        // TODO: Test.
+        $cm = get_coursemodule_from_instance('mediagallery', $instanceid);
+        $completion = new \completion_info(get_course($cm->course));
+        if ($completion->is_enabled($cm) == COMPLETION_TRACKING_AUTOMATIC) {
+            foreach ($completionupdateuserids as $userid) {
+                $completion->update_state($cm, COMPLETION_INCOMPLETE, $userid);
+            }
+        }
     }
 
     protected static function get_mediagallery_id_from_context(\context_module $context) {
diff --git a/db/events.php b/db/events.php
new file mode 100644
index 0000000..5a38f6d
--- /dev/null
+++ b/db/events.php
@@ -0,0 +1,37 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Media collection event handler definition.
+ *
+ * @package    mod_mediagallery
+ * @copyright  2023 Otago Polytechnic
+ * @author     James Calder
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$observers = [
+    [
+        'eventname' => '\mod_mediagallery\event\comment_created',
+        'callback' => '\mod_mediagallery\observers::comment_created',
+    ],
+    [
+        'eventname' => '\mod_mediagallery\event\comment_deleted',
+        'callback' => '\mod_mediagallery\observers::comment_deleted',
+    ],
+];
diff --git a/db/install.xml b/db/install.xml
index 5ad936c..8170e26 100644
--- a/db/install.xml
+++ b/db/install.xml
@@ -32,6 +32,9 @@
         <FIELD NAME="maxgalleries" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Maximum number of galleries per user/group"/>
         <FIELD NAME="allowcomments" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Allow users to comment of items and galleries"/>
         <FIELD NAME="allowlikes" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Allow users to like items"/>
+        <FIELD NAME="completiongalleries" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of galleries are required to mark this Media collection completed for a user."/>
+        <FIELD NAME="completionitems" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of items are required to mark this Media collection complete for a user."/>
+        <FIELD NAME="completioncomments" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of comments are required to mark this Media collection complete for a user."/>
         <FIELD NAME="objectid" TYPE="char" LENGTH="36" NOTNULL="false" SEQUENCE="false" COMMENT="Remote objectid if connected with an external system."/>
         <FIELD NAME="source" TYPE="char" LENGTH="10" NOTNULL="true" DEFAULT="moodle" SEQUENCE="false" COMMENT="Was this created in moodle or imported from elsewhere"/>
         <FIELD NAME="creator" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" COMMENT="If linked to external content, creator field from the external source."/>
diff --git a/db/upgrade.php b/db/upgrade.php
index 8b87fde..0010890 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -443,5 +443,25 @@ function xmldb_mediagallery_upgrade($oldversion) {
         upgrade_mod_savepoint(true, 2015082600, 'mediagallery');
     }
 
+    if ($oldversion < 2024080802) {  // TODO: Set actual version number.
+        $table = new xmldb_table('mediagallery');
+        $fields = [
+            new xmldb_field('completiongalleries', XMLDB_TYPE_INTEGER, '9', null, XMLDB_NOTNULL, null,
+                            '0', 'allowlikes'),
+            new xmldb_field('completionitems', XMLDB_TYPE_INTEGER, '9', null, XMLDB_NOTNULL, null,
+                            '0', 'completiongalleries'),
+            new xmldb_field('completioncomments', XMLDB_TYPE_INTEGER, '9', null, XMLDB_NOTNULL, null,
+                            '0', 'completionitems'),
+        ];
+
+        foreach ($fields as $field) {
+            if (!$dbman->field_exists($table, $field)) {
+                $dbman->add_field($table, $field);
+            }
+        }
+
+        upgrade_mod_savepoint(true, 2024080802, 'mediagallery');  // TODO: Set actual version number.
+    }
+
     return true;
 }
diff --git a/lang/en/mediagallery.php b/lang/en/mediagallery.php
index 1aea7e6..e1cd43f 100644
--- a/lang/en/mediagallery.php
+++ b/lang/en/mediagallery.php
@@ -83,6 +83,18 @@
 
 $string['comments'] = 'Comments';
 $string['completegallery'] = 'Complete gallery';
+$string['completioncomments'] = 'Student must add comments:';
+$string['completioncommentsdesc'] = 'Student must add at least {$a} comment(s)';
+$string['completioncommentsgroup'] = 'Require comments';
+$string['completiondetail:comments'] = 'Add comments: {$a}';
+$string['completiondetail:galleries'] = 'Add galleries: {$a}';
+$string['completiondetail:items'] = 'Add items: {$a}';
+$string['completiongalleries'] = 'Student must add galleries:';
+$string['completiongalleriesdesc'] = 'Student must add at least {$a} gallery/galleries';
+$string['completiongalleriesgroup'] = 'Require galleries';
+$string['completionitems'] = 'Student must add items:';
+$string['completionitemsdesc'] = 'Student must add at least {$a} item(s)';
+$string['completionitemsgroup'] = 'Require items';
 $string['configdisablestandardgallery'] = 'Prevent users from creating standard galleries.';
 $string['configenablethebox'] = 'This needs to be enabled in order for users to create new theBox based collections and content. If disabled, existing theBox collections will display a message saying the activity is currently unavailable. Standard collections will not be affected.';
 $string['configmaxbytes'] = 'Default maximum item file size for all media collections on the site (subject to course limits and other local settings)';
diff --git a/lib.php b/lib.php
index b533584..2ebf406 100644
--- a/lib.php
+++ b/lib.php
@@ -43,7 +43,7 @@ function mediagallery_supports($feature) {
         case FEATURE_COMPLETION_TRACKS_VIEWS:
             return true;
         case FEATURE_COMPLETION_HAS_RULES:
-            return false;
+            return true;
         case FEATURE_GRADE_HAS_GRADE:
             return false;
         case FEATURE_GRADE_OUTCOMES:
@@ -461,6 +461,82 @@ function mediagallery_pluginfile($course, $cm, $context, $filearea, array $args,
     send_stored_file($file, 0, 0, $forcedownload, $options); // Download MUST be forced - security!
 }
 
+/**
+ * Add a get_coursemodule_info function in case any Media collection type wants to add 'extra' information
+ * for the course (see resource).
+ *
+ * Given a course_module object, this function returns any "extra" information that may be needed
+ * when printing this activity in a course listing.  See get_array_of_activities() in course/lib.php.
+ *
+ * @param stdClass $coursemodule The coursemodule object (record).
+ * @return cached_cm_info An object on information that the courses
+ *                        will know about (most noticeably, an icon).
+ */
+function mediagallery_get_coursemodule_info($coursemodule) {
+    global $DB;
+
+    $dbparams = ['id' => $coursemodule->instance];
+    $fields = 'id, name, intro, introformat, completiongalleries, completionitems, completioncomments';
+    if (!$collection = $DB->get_record('mediagallery', $dbparams, $fields)) {
+        return false;
+    }
+
+    $result = new cached_cm_info();
+    $result->name = $collection->name;
+
+    if ($coursemodule->showdescription) {
+        // Convert intro to html. Do not filter cached version, filters run at display time.
+        $result->content = format_module_intro('mediagallery', $collection, $coursemodule->id, false);
+    }
+
+    // Populate the custom completion rules as key => value pairs, but only if the completion mode is 'automatic'.
+    if ($coursemodule->completion == COMPLETION_TRACKING_AUTOMATIC) {
+        $result->customdata['customcompletionrules']['completiongalleries'] = $collection->completiongalleries;
+        $result->customdata['customcompletionrules']['completionitems'] = $collection->completionitems;
+        $result->customdata['customcompletionrules']['completioncomments'] = $collection->completioncomments;
+    }
+
+    return $result;
+}
+
+/**
+ * Callback which returns human-readable strings describing the active completion custom rules for the module instance.
+ *
+ * @param cm_info|stdClass $cm object with fields ->completion and ->customdata['customcompletionrules']
+ * @return string[] $descriptions the array of descriptions for the custom rules.
+ */
+function mod_mediagallery_get_completion_active_rule_descriptions($cm): array {
+    // Values will be present in cm_info, and we assume these are up to date.
+    if (empty($cm->customdata['customcompletionrules'])
+        || $cm->completion != COMPLETION_TRACKING_AUTOMATIC) {
+        return [];
+    }
+
+    $descriptions = [];
+    foreach ($cm->customdata['customcompletionrules'] as $key => $val) {
+        switch ($key) {
+            case 'completiongalleries':
+                if (!empty($val)) {
+                    $descriptions[] = get_string('completiongalleriesdesc', 'mediagallery', $val);
+                }
+                break;
+            case 'completionitems':
+                if (!empty($val)) {
+                    $descriptions[] = get_string('completionitemsdesc', 'mediagallery', $val);
+                }
+                break;
+            case 'completioncomments':
+                if (!empty($val)) {
+                    $descriptions[] = get_string('completioncommentsdesc', 'mediagallery', $val);
+                }
+                break;
+            default:
+                break;
+        }
+    }
+    return $descriptions;
+}
+
 /**
  * Validate comment parameter before perform other comments actions
  *
diff --git a/mod_form.php b/mod_form.php
index f706d89..979a69e 100644
--- a/mod_form.php
+++ b/mod_form.php
@@ -258,6 +258,25 @@ public function data_preprocessing(&$toform) {
         if (isset($toform['galleryfocus'])) {
             $toform['gallerytypeoptions']['focus'] = $toform['galleryfocus'];
         }
+
+        // Set up the completion checkboxes which aren't part of standard data.
+        // We also make the default value (if you turn on the checkbox) for those
+        // numbers to be 1, this will not apply unless checkbox is ticked.
+        $toform['completiongalleriesenabled'] =
+            !empty($toform['completiongalleries']) ? 1 : 0;
+        if (empty($toform['completiongalleries'])) {
+            $toform['completiongalleries'] = 1;
+        }
+        $toform['completionitemsenabled'] =
+            !empty($toform['completionitems']) ? 1 : 0;
+        if (empty($toform['completionitems'])) {
+            $toform['completionitems'] = 1;
+        }
+        $toform['completioncommentsenabled'] =
+            !empty($toform['completioncomments']) ? 1 : 0;
+        if (empty($toform['completioncomments'])) {
+            $toform['completioncomments'] = 1;
+        }
     }
 
     /**
@@ -277,4 +296,77 @@ public function set_data($data) {
         parent::set_data($data);
     }
 
+    /**
+     * Add custom completion rules.
+     *
+     * @return string[] Array of string IDs of added items, empty array if none
+     */
+    public function add_completion_rules(): array {
+        $mform =& $this->_form;
+
+        $group = [];
+        $group[] =& $mform->createElement('checkbox', 'completiongalleriesenabled', '',
+                                            get_string('completiongalleries', 'mediagallery'));
+        $group[] =& $mform->createElement('text', 'completiongalleries', '', ['size' => 3]);
+        $mform->setType('completiongalleries', PARAM_INT);
+        $mform->addGroup($group, 'completiongalleriesgroup', get_string('completiongalleriesgroup', 'mediagallery'), [' '],
+                        false);
+        $mform->disabledIf('completiongalleries', 'completiongalleriesenabled', 'notchecked');
+
+        $group = [];
+        $group[] =& $mform->createElement('checkbox', 'completionitemsenabled', '', get_string('completionitems', 'mediagallery'));
+        $group[] =& $mform->createElement('text', 'completionitems', '', ['size' => 3]);
+        $mform->setType('completionitems', PARAM_INT);
+        $mform->addGroup($group, 'completionitemsgroup', get_string('completionitemsgroup', 'mediagallery'), [' '], false);
+        $mform->disabledIf('completionitems', 'completionitemsenabled', 'notchecked');
+
+        $group = [];
+        $group[] =& $mform->createElement('checkbox', 'completioncommentsenabled', '',
+                                            get_string('completioncomments', 'mediagallery'));
+        $group[] =& $mform->createElement('text', 'completioncomments', '', ['size' => 3]);
+        $mform->setType('completioncomments', PARAM_INT);
+        $mform->addGroup($group, 'completioncommentsgroup', get_string('completioncommentsgroup', 'mediagallery'), [' '],
+                        false);
+        $mform->disabledIf('completioncomments', 'completioncommentsenabled', 'notchecked');
+
+        return ['completiongalleriesgroup', 'completionitemsgroup', 'completioncommentsgroup'];
+    }
+
+    /**
+     * Called during validation. Indicates whether a module-specific completion rule is selected.
+     *
+     * @param array $data Input data (not yet validated)
+     * @return bool True if one or more rules is enabled, false if none are.
+     */
+    public function completion_rule_enabled($data): bool {
+        return (!empty($data['completiongalleriesenabled']) && $data['completiongalleries'] != 0) ||
+            (!empty($data['completionitemsenabled']) && $data['completionitems'] != 0) ||
+            (!empty($data['completioncommentsenabled']) && $data['completioncomments'] != 0);
+    }
+
+    /**
+     * Allows module to modify the data returned by form get_data().
+     * This method is also called in the bulk activity completion form.
+     *
+     * Only available on moodleform_mod.
+     *
+     * @param stdClass $data the form data to be modified.
+     */
+    public function data_postprocessing($data): void {
+        parent::data_postprocessing($data);
+        // Turn off completion settings if the checkboxes aren't ticked.
+        if (!empty($data->completionunlocked)) {
+            $autocompletion = !empty($data->completion) && $data->completion == COMPLETION_TRACKING_AUTOMATIC;
+            if (empty($data->completiongalleriesenabled) || !$autocompletion) {
+                $data->completiongalleries = 0;
+            }
+            if (empty($data->completionitemsenabled) || !$autocompletion) {
+                $data->completionitems = 0;
+            }
+            if (empty($data->completioncommentsenabled) || !$autocompletion) {
+                $data->completioncomments = 0;
+            }
+        }
+    }
+
 }
diff --git a/rest.php b/rest.php
index 711c3f3..e2fc625 100644
--- a/rest.php
+++ b/rest.php
@@ -86,7 +86,16 @@
             $info->likes = $count;
             echo json_encode($info);
         } else if ($action == 'sample') {
-            $info = $object->copy($data[0]);
+            $object->copy($data[0]);
+            // Return new activity completion info.
+            $cminfo = get_fast_modinfo($course, $USER->id)->cms[$cm->id];
+            $completion = \core_completion\cm_completion_details::get_instance($cminfo, $USER->id);
+            $activitydates = \core\activity_dates::get_dates_for_module($cminfo, $USER->id);
+            $actinfo = new \core_course\output\activity_information($cminfo, $completion, $activitydates);
+            $actinfoeft = $actinfo->export_for_template($OUTPUT);
+            $actinfohtml = $OUTPUT->render_from_template('core_course/activity_info', $actinfoeft);
+            $info = new stdClass();
+            $info->actinfohtml = $actinfohtml;
             echo json_encode($info);
         }
     break;
@@ -112,7 +121,16 @@
 
         }
         if ($success) {
-            echo json_encode('success');
+            // Return new activity completion info.
+            $cminfo = get_fast_modinfo($course, $USER->id)->cms[$cm->id];
+            $completion = \core_completion\cm_completion_details::get_instance($cminfo, $USER->id);
+            $activitydates = \core\activity_dates::get_dates_for_module($cminfo, $USER->id);
+            $actinfo = new \core_course\output\activity_information($cminfo, $completion, $activitydates);
+            $actinfoeft = $actinfo->export_for_template($OUTPUT);
+            $actinfohtml = $OUTPUT->render_from_template('core_course/activity_info', $actinfoeft);
+            $info = new stdClass();
+            $info->actinfohtml = $actinfohtml;
+            echo json_encode($info);
         } else {
             throw new moodle_exception("failed to delete $class $id");
         }
diff --git a/test.php b/test.php
new file mode 100644
index 0000000..dd54f7f
--- /dev/null
+++ b/test.php
@@ -0,0 +1,64 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Tests
+ *
+ * @package    mod_mediagallery
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+require_once('../../config.php');
+
+require_admin();
+
+// TODO: Delete this file.
+
+$action = optional_param('action', '', PARAM_ALPHANUMEXT);
+$id = optional_param('id', 0, PARAM_INT); // A course_module id.
+$user1id = optional_param('user1id', 0, PARAM_INT);
+$user2id = optional_param('user2id', 0, PARAM_INT);
+
+if ($id) {
+    $cm         = get_coursemodule_from_id('mediagallery', $id, 0, false, MUST_EXIST);
+    $course     = $DB->get_record('course', ['id' => $cm->course], '*', MUST_EXIST);
+    $mediagallery = new \mod_mediagallery\collection($cm->instance);
+    $context = \context_module::instance($cm->id);
+}
+
+if ($user1id) {
+    $user1 = $DB->get_record('user', ['id' => $user1id]);
+    $userlist = new \core_privacy\local\request\approved_userlist($context, 'mod_mediagallery', [$user1id]);
+    $contextlist = new \core_privacy\local\request\approved_contextlist($user1, 'mod_mediagallery', [$context->id]);
+}
+
+if ($user2id) {
+    $userlist = new \core_privacy\local\request\approved_userlist($context, 'mod_mediagallery', [$user1id, $user2id]);
+}
+
+echo "<p>Action: {$action}</p>\n";
+
+if ($action == 'delete_data_for_all_users_in_context') {
+    \mod_mediagallery\privacy\provider::delete_data_for_all_users_in_context($context);
+} else if ($action == 'delete_data_for_user') {
+    \mod_mediagallery\privacy\provider::delete_data_for_user($contextlist);
+} else if ($action == 'delete_data_for_users') {
+    \mod_mediagallery\privacy\provider::delete_data_for_users($userlist);
+} else {
+    echo "<p>Unknown action</p>\n";
+}
+
+echo "<p>Done</p>\n";
diff --git a/version.php b/version.php
index 6323a09..2265003 100644
--- a/version.php
+++ b/version.php
@@ -28,7 +28,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version = 2024080801;
+$plugin->version = 2024080802;  // TODO: Set actual version number.
 $plugin->requires = 2023100900;
 $plugin->component = 'mod_mediagallery';
 $plugin->maturity = MATURITY_STABLE;
diff --git a/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base-debug.js b/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base-debug.js
index 7bf9ee7..aa50104 100644
--- a/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base-debug.js
+++ b/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base-debug.js
@@ -328,6 +328,9 @@ M.mod_mediagallery.base = {
                     if (selector) {
                         Y.one(selector + '[data-id=' + data.id + ']').remove();
                     }
+                    if (responsetext.actinfohtml && Y.one('.activity-information')) {
+                        Y.one('.activity-information').replace(responsetext.actinfohtml);
+                    }
                     if (data['class'] === 'collection') {
                         // Redirect to course.
                         window.location.href = M.cfg.wwwroot + '/course/view.php?id=' + this.courseid;
@@ -752,6 +755,9 @@ M.mod_mediagallery.base = {
                                 } catch (e) {
                                     new M.core.ajaxException();
                                 }
+                                if (responsetext.actinfohtml && Y.one('.activity-information')) {
+                                    Y.one('.activity-information').replace(responsetext.actinfohtml);
+                                }
                             },
                             failure : function() {
                             }
diff --git a/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base-min.js b/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base-min.js
index fa6a970..9051b81 100644
--- a/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base-min.js
+++ b/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base-min.js
@@ -1,3 +1,3 @@
 YUI.add("moodle-mod_mediagallery-base",function(r,e){M.mod_mediagallery=M.mod_mediagallery||{},M.mod_mediagallery.base={defaultitemwidth:187,courseid:0,mid:0,gallery:0,lbg_setup_ran:!1,options:{enablecomments:!1,enablelikes:!1,mode:"standard"},uri:M.cfg.wwwroot+"/mod/mediagallery/rest.php",init:function(e,t,o,a,i,l){this.courseid=e,this.mid=t,this.gallery=i,l&&l.enablecomments&&(this.options.enablecomments=!0),l&&l.enablelikes&&(this.options.enablelikes=!0),l&&l.mode&&(this.options.mode=l.mode),!a&&"gallery"!==o||("thebox"!==this.options.mode?this.watch_editing_buttons(o):this.watch_delete_thebox(o)),0===i&&"gallery"===o&&this.add_remove_collection_handler(),a||this.watch_mediasize(),this.setup_sample_link(),this.watch_resize()},add_remove_collection_handler:function(){var o,a,i,e=r.one(".collection.actions .remove");e&&(o=e.hasClass("owner"),a={title:M.str.mod_mediagallery.confirmcollectiondelete,question:M.str.mod_mediagallery.removecollectionconfirm,yesLabel:M.str.moodle.submit,noLabel:M.str.moodle.cancel,closeButtonTitle:M.str.moodle.cancel},i={"class":"collection",id:this.mid},this._confirmationListener=this._confirmationListener||e.on("click",function(e){var t;e.preventDefault(),o?(e=M.str.mod_mediagallery.deleteorremovecollection,e=(e+='<br/><input type="textbox" name="deleteorremove"/><br/>')+M.str.mod_mediagallery.deleteorremovecollectionwarn,a.question='<div class="deleteorremove">'+e+"</div>",(t=new M.core.confirm(a)).on("complete-yes",function(){i.action="remove";var e=r.one('input[name="deleteorremove"]');if(e)if("DELETE"===e.get("value").toUpperCase())i.action="delete";else if(""!==e.get("value"))return;this._confirmationListener.detach(),M.mod_mediagallery.base.delete_object(i)},this)):(t=new M.core.confirm(a),i.action="remove",t.on("complete-yes",function(){this._confirmationListener.detach(),M.mod_mediagallery.base.delete_object(i)},this)),t.show()},this))},watch_delete_thebox:function(a){var i="item"===a?".item":".gallery_list_item",l={title:M.str.mod_mediagallery["confirm"+a+"delete"],yesLabel:M.str.moodle.submit,noLabel:M.str.moodle.cancel,closeButtonTitle:M.str.moodle.cancel};r.all(i+" .controls .delete").each(function(){this._confirmationListener=this._confirmationListener||this.on("click",function(e){var t,o;e.preventDefault(),e=this.hasClass("owner"),(t=this.ancestor("div"+i).getData())["class"]=a,e?(e=M.str.mod_mediagallery["deleteorremove"+a],e=(e+='<br/><input type="textbox" name="deleteorremove"/><br/>')+M.str.mod_mediagallery["deleteorremove"+a+"warn"],l.question='<div class="deleteorremove">'+e+"</div>",(o=new M.core.confirm(l)).on("complete-yes",function(){t.action="remove";var e=r.one('input[name="deleteorremove"]');if(e)if("DELETE"===e.get("value").toUpperCase())t.action="delete";else if(""!==e.get("value"))return;this._confirmationListener.detach(),M.mod_mediagallery.base.delete_object(t,i)},this)):(l.question=M.str.mod_mediagallery["remove"+a+"confirm"],o=new M.core.confirm(l),t.action="remove",o.on("complete-yes",function(){this._confirmationListener.detach(),M.mod_mediagallery.base.delete_object(t,i)},this)),o.show()},this)})},watch_editing_buttons:function(o){var a="item"===o?".item":".gallery_list_item",i={title:M.str.mod_mediagallery["confirm"+o+"delete"],origquestion:M.str.mod_mediagallery["delete"+o]+" ",yesLabel:M.str.moodle.yes,noLabel:M.str.moodle.cancel,closeButtonTitle:M.str.moodle.cancel};r.all(a+" .controls .delete").each(function(){this._confirmationListener=this._confirmationListener||this.on("click",function(e){var t;e.preventDefault(),t=this.ancestor("div"+a).getData(),i.question=i.origquestion+t.title+"?",(e=new M.core.confirm(i)).on("complete-yes",function(){this._confirmationListener.detach(),t["class"]=o,M.mod_mediagallery.base.delete_object(t,a)},this),e.show()},this)})},watch_mediasize:function(){var e=".mediasize_selector select";r.one(e)&&r.one(e).on("change",function(e){var t,o,a;e.preventDefault(),(t=r.one(".gallery")).removeClass("small"),t.removeClass("large"),a="","0"===(o=e.target.get("value"))?a="small":"2"===o&&(a="large"),""!==a&&t.addClass(a),require(["core_user/repository"],function(e){e.setUserPreference("mod_mediagallery_mediasize",o)})})},add_gallery_info_modal:function(e,t){var o,a=r.Node.create('<div class="metainfo"></div>'),i='<a href="'+M.cfg.wwwroot+"/user/view.php?id="+t.userid;i+="&course="+e+'">'+t.firstname+" "+t.lastname+"</a>",e=[[M.str.mod_mediagallery.galleryname,t.name],[M.str.mod_mediagallery.creator,i]],null!==t.groupname&&e.push([M.str.moodle.group,t.groupname]),r.each(e,function(e){r.Node.create('<div class="field">'+e[0]+'</div><div class="value">'+e[1]+"</div>").appendTo(a)}),o={headerContent:M.str.mod_mediagallery.information,bodyContent:a,modal:!0},r.one(".gallery_list_item[data-id="+t.id+"] .action-icon.info").on("click",function(e){e.preventDefault(),new M.core.dialogue(o).show()})},add_item_info_modal:function(e){var t,a=r.Node.create('<div class="metainfo"></div>'),i=[[M.str.mod_mediagallery.caption,e.caption],[M.str.mod_mediagallery.datecreated,e.timecreatedformatted],[M.str.moodle.fullnameuser,e.firstname+" "+e.lastname],[M.str.moodle.username,e.username],[M.str.moodle.group,e.groupname],[M.str.moodle.description,e.description],[M.str.mod_mediagallery.moralrights,"1"==e.moralrights?M.str.moodle.yes:M.str.moodle.no],[M.str.mod_mediagallery.copyright,e.copyrightformatted],[M.str.mod_mediagallery.originalauthor,e.originalauthor],[M.str.mod_mediagallery.productiondate,e.productiondateformatted],[M.str.mod_mediagallery.medium,e.medium],[M.str.mod_mediagallery.publisher,e.publisher],[M.str.mod_mediagallery.broadcaster,e.broadcaster],[M.str.mod_mediagallery.reference,e.reference],[M.str.mod_mediagallery.tags,e.tags]];r.each(i,function(e,t){var o=!0;(o=4!==t&&3!==t&&7!=t||null!==i[t][1]&&""!==i[t][1]?o:!1)&&r.Node.create('<div class="field">'+e[0]+'</div><div class="value">'+e[1]+"</div>").appendTo(a)}),t={headerContent:M.str.mod_mediagallery.information,bodyContent:a,modal:!0},r.one(
-".item[data-id="+e.id+"] .action-icon.info").on("click",function(e){e.preventDefault(),new M.core.dialogue(t).show()})},delete_object:function(i,l){i.m=this.mid,i.sesskey=M.cfg.sesskey,r.io(M.mod_mediagallery.base.uri,{method:"DELETE",data:i,on:{success:function(e,t){try{var o=r.JSON.parse(t.responseText);o.error&&new M.core.ajaxException(o)}catch(a){new M.core.ajaxException}l&&r.one(l+"[data-id="+i.id+"]").remove(),"collection"===i["class"]&&(window.location.href=M.cfg.wwwroot+"/course/view.php?id="+this.courseid)},failure:function(){0}},context:this,sync:!0})},lbg_setup:function(){var e,t;this.lbg_setup_ran||(this.lbg_setup_ran=!0,e=r.one(".lb-social"),t='<div class="lb-extradetails"></div><div class="lb-socialactions">',this.options.enablelikes&&(t=(t+='<a class="like" href="#"><div class="like"></div>')+M.str.mod_mediagallery.like+'</a><span id="lb-likedby"></span>'),e.setHTML(t+='<span id="lb-fullsize"></span></div><div id="lb-comments"></div>'),r.delegate("click",function(e){var o,t,a,i;e.preventDefault(),e="like",o=1,t="unlike",a='<div class="unlike"></div>',r.one(".lb-socialactions a.like div").hasClass("unlike")&&(e="unlike",o=0,t="like",a='<div class="like"></div>'),i=r.one(".lb-data"),i={sesskey:M.cfg.sesskey,m:M.mod_mediagallery.base.mid,id:i.getData("itemid"),"class":"item",action:e},r.io(M.mod_mediagallery.base.uri,{method:"POST",data:i,on:{success:function(e,t){t=JSON.parse(t.responseText);M.mod_mediagallery.base.update_likes(t.likes,o)}},context:this,sync:!0}),r.one(".lb-socialactions a.like").setHTML(a+M.str.mod_mediagallery[t])},".lb-social",".lb-socialactions a.like"))},update_likes:function(e,t){var o="";0<e&&(o="&nbsp;&bull;&nbsp;",o+=M.str.mod_mediagallery.likedby+": ",t&&(e-=1,o+=M.str.mod_mediagallery.you+", "),o=(o+=e+" ")+(1!=e?M.str.mod_mediagallery.others:M.str.mod_mediagallery.other)),r.one("#lb-likedby").setHTML(o)},lbg_change:function(a,e){var i;this.lbg_setup_ran||this.lbg_setup(),r.one(".lb-data").setData("itemid",a.itemid),"0"!==a.player&&"2"!==a.player||this.lbg_embed_player(a.itemid,e),i=r.one(".lb-data"),e={sesskey:M.cfg.sesskey,m:M.mod_mediagallery.base.mid,id:i.getData("itemid"),"class":"item",action:"socialinfo"},r.io(M.mod_mediagallery.base.uri,{method:"GET",data:e,on:{success:function(e,t){var o,t=JSON.parse(t.responseText);t.commentcontrol&&(r.one("#lb-comments").setHTML(t.commentcontrol),o={client_id:t.client_id,contextid:t.contextid,itemid:i.getData("itemid"),component:"mod_mediagallery",commentarea:"item"},M.core_comment.init(r,o)),this.options.enablelikes&&(o='<div class="like"></div>',t.likedbyme?(o='<div class="unlike"></div>',r.one(".lb-socialactions a.like").setHTML(o+M.str.mod_mediagallery.unlike)):r.one(".lb-socialactions 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\ No newline at end of file
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\ No newline at end of file
diff --git a/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base.js b/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base.js
index 7bf9ee7..aa50104 100644
--- a/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base.js
+++ b/yui/build/moodle-mod_mediagallery-base/moodle-mod_mediagallery-base.js
@@ -328,6 +328,9 @@ M.mod_mediagallery.base = {
                     if (selector) {
                         Y.one(selector + '[data-id=' + data.id + ']').remove();
                     }
+                    if (responsetext.actinfohtml && Y.one('.activity-information')) {
+                        Y.one('.activity-information').replace(responsetext.actinfohtml);
+                    }
                     if (data['class'] === 'collection') {
                         // Redirect to course.
                         window.location.href = M.cfg.wwwroot + '/course/view.php?id=' + this.courseid;
@@ -752,6 +755,9 @@ M.mod_mediagallery.base = {
                                 } catch (e) {
                                     new M.core.ajaxException();
                                 }
+                                if (responsetext.actinfohtml && Y.one('.activity-information')) {
+                                    Y.one('.activity-information').replace(responsetext.actinfohtml);
+                                }
                             },
                             failure : function() {
                             }
diff --git a/yui/src/base/js/base.js b/yui/src/base/js/base.js
index 02f13c8..af8f513 100644
--- a/yui/src/base/js/base.js
+++ b/yui/src/base/js/base.js
@@ -326,6 +326,9 @@ M.mod_mediagallery.base = {
                     if (selector) {
                         Y.one(selector + '[data-id=' + data.id + ']').remove();
                     }
+                    if (responsetext.actinfohtml && Y.one('.activity-information')) {
+                        Y.one('.activity-information').replace(responsetext.actinfohtml);
+                    }
                     if (data['class'] === 'collection') {
                         // Redirect to course.
                         window.location.href = M.cfg.wwwroot + '/course/view.php?id=' + this.courseid;
@@ -750,6 +753,9 @@ M.mod_mediagallery.base = {
                                 } catch (e) {
                                     new M.core.ajaxException();
                                 }
+                                if (responsetext.actinfohtml && Y.one('.activity-information')) {
+                                    Y.one('.activity-information').replace(responsetext.actinfohtml);
+                                }
                             },
                             failure : function() {
                             }