Attachments (uploaded from device) deleted from the Deck UI are not deleted from the user's ‘/Deck’ folder

Files added as attachments to Deck cards (via an upload from the computer...) are stored (like other attachments added from Files) in the ‘/Deck’ folder of the user performing the action.

We found that our ‘/Deck’ folders for each user were abnormally large. We found that when an attachment uploaded from the computer is deleted from a card, it is not deleted from the ‘/Deck’ folder.

As a result, there's a big mess in each user's ‘/Deck’ folder, because among the files that are still in use, there are lots of unused files that take up space for nothing on the user quota, which is annoying for some users who have a reduced quota.

When a file uploaded from a device is deleted, it should also be deleted from the ‘/Deck’ folder. In this way, the folder will be lighter and clearer if you need to interact with it directly.

It seems to occur in all recent Deck version (e.g. Deck for NC 29, 30, 31).

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Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to a card
2. Upload attachment file
3. Go to files in Deck folder and see the attached file
4. Delete file from Deck card
5. See in Files in Deck folder that the file is still here

Expected behavior
File should disappear from /Deck in "Files"

Client details:

• OS: Ubuntu Desktop 22.04
• Browser FF 135.0.1

Tested on :

• NC 31.0.0 / Deck 1.15.0
• NC 30.0.6 / Deck 1.14.4
• NC 29.0.12 / Deck 1.13.4

Other details or logs can be provided but IMO, this can be easily reproduced.

Reproduce the issue using the listed Deck steps on a supported Nextcloud/Deck version, then trace the attachment deletion flow from the Deck card UI to the user's /Deck folder. Done means a device-uploaded attachment removed from a card also disappears from /Deck, while files still in use remain available.