I got the Vero 4k recently and I initially had no issues setting it up and connecting it to my NAS’ UPnP server, and playback was fine.
The second time I used the Vero it ‘couldn’t connect to network server’. I then tried zeroconfig and was able to connect to the NAS’ home directory but opening any subfolder led to a ‘file exists’ error.
I just installed the January update and the problem still persists.
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What is the ‘File exists’ error? You would have to explain what you have done and share debug enabled logs.
UPnP works for some people but surely it is not the sharing technology I would suggest to use.
Did you tried to change Max Protocol Version to SMB1 and than add the SMB Share as source?
I suggest to first clean your library and then try to add that way and if problem remains provide debug enabled logs afterwards.