Cannot upload large files

Thanks a lot for the great app! We discovered a problem uploading large files via the Nextcloud app:

Steps to reproduce

1. Open Nextcloud app (iphone, ipad)
2. Enable Chunking in settings to 10 MB
3. Upload 2GB file

Expected behaviour

• Upload starts

Actual behaviour

Error Message "Could not read the file" (read_file_error)

Tested on ipad and iphone with two nextcloud installations, installed by different admins.

BUT: If I copy the file within the Apple "Files" Application to the Nextcloud-Location it is working. It's also working with small files (so it seems to be no permission problem). It's also working from Android app. It's also working using Safari.

Logs

No log output in app even with highest log level

Reasoning or why should it be changed/implemented?

Seems to be a bug

Environment data

iOS 14.4.2 (ipad)
iOS 14.6 (iphone)

Nextcloud iOS app version: see More > Settings

4.0.5.8

Server operating system:

Ubuntu 20.04.2 LTS

Web server: Apache, nginx

nginx 1.18.0

Database:

MariaDB 10.3.30

PHP version:

7.4.3

Nextcloud version: see Nextcloud admin page

21.0.3
19.x
20.x

If we can contribute with any further information we are glad to assist, also we can do debugging server-side. In our eyes it seems to be a problem with the application (though uploading large files with the mobile application seems to be not the most common use case ;) We also found #221 but it's not clear if it's a related problem.

Start by reproducing the failure in the iOS app with 10 MB chunking and a 2 GB file, then compare it with small files and the working Files, Android, and Safari uploads. Done means large uploads start successfully without the “Could not read the file” error, with coverage for the listed iPhone and iPad environments.