Auto-Upload stalls

Steps to reproduce

1. Enable Automatic Upload (Photos & Videos).
2. Start large upload (camera roll) of all photos (not just the latest defined by the day the auto-upload is enabled).
3. Put app to background / phone locks → upload stalls.
4. Re-enter app → queue stuck; Settings → Advanced freezes.

Tried already: maintenance:repair, files:scan(-app-data), Redis flush (AUTH), new target folder, app reinstall.

Expected behaviour

Upload resumes in background or cleanly continues in foreground.

Actual behaviour

Stalls/queue hang; app settings sometimes freeze.

Only uploading new pics seems to still work, so probably it is a data size problem. Actually the problem started last week during vacation when I tried to sync my photos with unreliable internet connection. I then re-setup the upload because files are still missing and it continuously stalls.

When I enter the settings -> Autoupload menu, I get a warning msg saying that it cannot be activated in the background.

When I access the app's settings in the iPhone's general settings -> Apps menu, I see the "background refresh" switch being on and I cannot switch it off.

Logs

Reasoning or why should it be changed/implemented?

Environment data

iOS version: latest

Nextcloud iOS app version: latest

Server operating system: Ubuntu Server LTS, latest

Web server: AIO standard config

Database: AIO standard config

PHP version: AIO standard config

Nextcloud version: latest AIO

Start by reproducing Automatic Upload with a large camera-roll upload, then background the app or lock the phone and check the queue and Settings → Advanced behavior. Trace the upload queue and background-resume flow; done means uploads continue or recover cleanly after backgrounding without freezing settings.