Depending on how the connection is made, I get two different paths to the same file on my VM host machine from the VM:

The connection path syntax after using Files "Other Locations > connect to server" for initial connection from Ubuntu 20.10 beta VM to host machine:
It works to play the file.

Typical connection path syntax saved in my old music player playlists, which previously worked:
This syntax no longer works to access files - it must be changed to the first path above,
My question is:
What is the significance of adding dmn@ (username@) into the path vs. leaving it out?