Nextcloud file download bigger then 4MB error and PDF Viewer Problems

Nextcloud version (eg, 20.0.5): 22.5
Operating system and version (eg, Ubuntu 20.04): 20.04.4
Installed on VM
PHP version (eg, 7.4): 7.4.3

Hello Community,
I have the following problem (Error exists since two weeks):
Downloading files from my Nextcloud that are larger than 4MB fails. No matter from which browser. When viewing files larger than 4MB I get the following error message:
PDF.js version 2.9.359 (build: e667c8cbc)
Message: network error

I can download all files under 4MB without any problems and view them with the pdf viewer.

There are no problems when uploading

Which logs are needed for the analysis?

Thank you!

Hello @w.kinas ,

welcome to the community of Nextcloud.

Is that in general independant from file type? Or only PDF?

Hello @rakekniven

It affects all file types.

I also noticed that my login background is no longer visible

Ok, so your topic title might be missleading.

Check your nextcloud.log for details.