No Apps available in new docker nc26


I switched my Nextcloud from a Webinstall to a Docker instance. But since I switched to Docker, I can’t install my apps. So I miss my group folders.

I installed Nextcloud as a compose and everything works well.
Any hints what I can search for to solve this?

also I can’t sent emails. But I can connect from remote to my Nextcloud behind a HA-proxy.

The content part in the screens stays black, when I click on apps.