Thanks for your help so far. It takes a moment, before I found time to work on this issue.
The /var/lib/univention-appcenter/apps/nextcloud/data/nextcloud-data is now mounted from my Freenas system. And the freenas is a member server from the same domain, but I can’t assign the access right’s. I receive a message Operation not permitted.
As I already mention, I’m a Windows Admin. Can one off you, drive me on the right direction, how I can solve this issue?
I’m assume I need first apply some access rights on the folder in Freenas, which one is shared as a nfs4 share, before I can change the access rights on the Univention system.
Thanks for your support!