Amplify.Storage does not invoke "resultListener" block while Application is in Background

[chintan1891]

Describe the bug

I have implemented "Amplify.Storage.uploadFile" for File upload. But if my app goes in background, then my "resultListener" block is not getting called.

Steps To Reproduce

Steps to reproduce the behavior:
1. Implement "Amplify.Storage.uploadFile"
2. Start File Uploading
3. Put Application in Background
4. Check S3 Console, File is not being uploaded there

Expected behavior

File should get uploaded in background

Amplify Framework Version

1.23.0

Amplify Categories

Storage

Dependency manager

Cocoapods

Swift version

5

CLI version

Xcode version

13.3.1

Relevant log output

No response

Is this a regression?

No

Regression additional context

No response

Device

iPhone 7

iOS Version

15.4

Specific to simulators

No response

Additional context

No response

[ameter]

Hi @chintan1891, can you share a snippet of the code you're using to perform the upload? Also, does the upload work correctly when the app remains in the foreground?

[chintan1891]

Yes, Upload works perfectly fine while app is in foreground.
Here is the code snippet:

let uploadOperation = Amplify.Storage.uploadFile(
    key: key,
    local: fileURL,
    progressListener: { progress in
        Logger.log("Progress: \(progress) %")
    }, resultListener: { event in
        self.semaphore.signal()
        switch event {
        case let .success(data):
            Logger.log("File \(filename) uploaded: \(data)")
        case let .failure(storageError):
            Logger.log("Failed to upload file \(filename): \(storageError.errorDescription). \(storageError.recoverySuggestion)")
        }
    }
)

[chintan1891]

@harsh62 any update on this?

[harsh62]

@chintan1891 Amplify Storage doesn't currently support background transfers. You might need to take a look at Transfer Utility documentation. Also linking background transfers documentation if you want to look at managing background transfers.

We are tracking support for background operations in Amplify.Storage in #1102