Media tmp files aren't cleaned up after upload

[z3ntu]

⚠️ Before posting ⚠️

• [X] This is a bug, not a question or an enhancement.
• [X] I've searched for similar issues and didn't find a duplicate.
• [X] I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
• [X] I agree to follow Nextcloud's Code of Conduct.

Steps to reproduce

1. Press + FAB -> Upload content from other apps -> (Google) Photos -> Select ~100 photos/videos (note: I uploaded to "External storage" configured in web UI which was another Local directory on my server, not sure if this makes a difference)
2. Observe all photos being uploaded...
3. Checking with Disk Usage app (e.g. https://f-droid.org/packages/com.google.android.diskusage/) you can see the uploaded files will be duplicated in Internal storage Android/media/com.nextcloud.client/nextcloud/myuser@myserver/ (sidenote [0]) and Internal storage Android/media/com.nextcloud.client/nextcloud/tmp/myuser@myserver/
4. After deleting the files cached in Nextcloud app again via "On device" the app the files in Android/media/com.nextcloud.client/nextcloud/tmp/myuser@myserver/ continue to persist on disk and use up storage.

[0] I find this honestly a questionable decision because this will essentially duplicate all uploaded files and in my case I uploaded ~8GB so afterwards I had 8GB more used, but this issue is not about this.

Expected behaviour

The files in the tmp subdirectory shouldn't exist after they've been by whatever creates them.

Actual behaviour

The files in tmp subdirectory continue to exist.

Android version

11

Device brand and model

Fairphone 4

Stock or custom OS?

Stock

Nextcloud android app version

3.21.1

Nextcloud server version

24.0.4

Using a reverse proxy?

Yes

Android logs

No response

Server error logs

No response

Additional information

No response

[auroraanna]

I think I'm having the same issue when trying to backup my apps and other files with Seedvault to Nextcloud. After the backup the Nextcloud app has 5.25 GB in user data and it's not going away.

[z3ntu]

@auroraanna If you select "On device" section in the navigation drawer, do you see any files listed there?

[auroraanna]

@z3ntu Not sure, I think there wasn't anything there. I uninstalled the app so I can't tell you. It took up dangerously much space to the point where Android was warning me that I only had 400 MB left.

[auroraanna]

Not giving Nextcloud filesystem permissions solves it though I can't use the app for much else now.

[auroraanna]

Nope, still taking up 5+ GB

[z3ntu]

The Nextcloud app on my phone again takes up around 8GB, probably mostly camera pictures/videos that are synced using the auto-upload feature. Even some (hidden) button in the settings to clean this stuff up would be great, if the bug can't be fixed anytime soon.