Auto Upload Photos: Pictures are not fully uploaded

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Steps to reproduce

1. Use Auto-Upload with a large number of photos
2. A small number of photos is not fully uploaded (has a grey area without any data) and is unusable

Expected behaviour

Photos should be correctly uploaded

Actual behaviour

Pictures are unusable

Logs

If applicable, you can post the iOS app or server logs (removing any sensitive information).

Reasoning or why should it be changed/implemented?

Environment data

iOS version: e.g. iOS 17.6.1
iOS 26.2 / iOS 26.3
Nextcloud iOS app version: see More > Settings
7.2.3
Server operating system:
Managed (wolkesicher.de)
Web server: Apache, nginx
Managed (wolkesicher.de)

Database:
Managed (wolkesicher.de)

PHP version:
Managed (wolkesicher.de)

Nextcloud version: see Nextcloud admin page
Nextcloud Server 31.0.14

Start by reproducing Auto-Upload with a large number of photos on iOS 26.2 or 26.3 using Nextcloud iOS app 7.2.3; no source file, test, or logs are identified in the issue. Done means every selected photo is fully uploaded and usable without grey areas.