Music files are stored on a Synology 216+nas. A+ states it is connected however, files do not load. VER 1.0.0 .1021
Audirvana Plus is a UPnP/DLNA control point with a ad-hoc server.
You can get more details here: https://audirvana.com/network-playback
So it can’t read the files from another media server. The solution is then to open standard SMB file share on your NAS, and add the network shared folder to the synchronized list in Audirvana Plus settings