Synology Plex not finding all files

Just to be crystal clear: Plex has loaded 4,409 out of 9,735 of the artists in my collection. And since I can’t find a way to determine the total number of actual files that are in my Plex library, I can’t figure out how many FILES are missing. In my random sampling of playback, several albums only have one or two tracks in them, and many albums by some artists are missing completely. Obviously, it has lots of content loaded, but I’ve been trying since September to force scan, not force scan, add the target folders, remove them, re-add them, with no progress towards completion.

The path I have used is: /volume1/PlexMediaServer/Media/Music