sign_oca: download fully signed document

[kobros-tech]

We would love to enable portal users to download their signed document from their portal app in addition to the existing feature that sends them the signed document link.

I ask @victoralmau to guide me where is the place to get the signed document link.

Thanks

[github-actions]

There hasn't been any activity on this issue in the past 6 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days.
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