I did then I get
Attempt 3/3 failed with 1 errors and: directory not found
I followed the how to - that is the URL like it is in the howto - and also like it is documented in the nextcloud manual (see the link in the how to).
I'm also able to mount it as a drive in windows using this URL and the user.
Ok now I checked the release notes -
in 1.63.0
nextcloud: Add support for chunked uploads
and 1.63.1
Nextcloud: fix must use /dav/files/USER endpoint not /webdav error
So I tried with 1.62.2 - and it worked !
Thanks