The valuations of the E2EE App are very negative as shown on the website:
https://apps.nextcloud.com/apps/end_to_end_encryption
But i don’t want to relinquish on E2EE in Nextcloud. I searched the web and found this one
https://cryptomator.org/de/downloads/
The tool allows to interoperate with several cloud services e.g. via Webdav with Nextcloud either.
Using Webdav all i need was to setup the folder location in my nextcloud files dir with
https://server.domain.de/remote.php/dav/files/MY-NEXTCLOUD-USERNAME
User = MY-NEXTCLOUD-USERNAME
Pass = NC-Password or (if 2FA is used) App-Password
It is working like a charm under NC 23.0.2
The tool exists for Android, iOS, Linux, MacOSX and Windows as well.
If any one else has made same experiences …