Okay. Unfortunately I don’t know, as I am not that familiar with Chorus. Maybe the Kodi forum has some advice.
I think, it is not possible with Chorus2 to play back music on the PC’s local device via the web page if the audio files are not entered in the mediacenter library.
The right kodi forum for Chorus 2 is here.
There is already a similiar old thread opened in 2018 without any answer, see here.
thanks Jim - that makes sense, but good to clarify that it’s not a fault with my config.