Thank you - it works now as you described it.
The error before was exactly due to a wrong information in a post I read earlier (which was quoted in the post have quoted). The post WebDAV URLs of Common Cloud Storage Services stated the wrong syntax for ownCloud WEBDAV access. And I had copied his syntax already - now returned back to my previous syntax, and it works.
The misleading post states that the owncloud syntax should be:
https://{host}/{path}/remote.php/webdav (this syntax is wrong and not working for me)
However the correct syntax is:
https://{host}/remote.php/webdav/{path}