Pick existing files in your Nextcloud to "upload" as a new attachment

[wargreen]

I've search for a similar issue but found nothing... Sorry if it's a duplicate.

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Is your feature request related to a problem? Please describe.

We use Deck for music tour managing, and use a lot mobile apps. We need to link some fast-changing files in decks so we can't upload a new version on each card. Link file from Files app is the perfect solution for us but we can't do that only via the web UI. Also, via the Deck app, we can't delete attachment or link it in the description.

Describe the solution you'd like

A similar workflow that on the web UI would be very useful.

In the card's attachment view :

• Import from file button

In the context menu of an attachment :

• View in file app
• Download
• Delete from attached files

In the description of a card :

• Add a link to an attached file, or better a full toolbar for the markdown editor (but maybe that is another topic :) for allow users that don't know how to user markdown to edit the descriptions without be scared by a non-WYSIWYG stuff.

Describe alternatives you've considered

I've try to link in the description of a file but the markdown should be write by hand in this android app. Use a file from the NC integration in the android's files re-upload the file in the /Deck dir.

Additional context

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