I keep my media in the iTunes successors TV.app and Music.app on macOS, so I want as much information to be in both places as possible.
I can get Tags in Plex filled from TV.app by setting long Genre names: “Thriller/Crime/Drama” for instance, to create three tags in Plex. The problem with this method is that it means comparatively few movies end up with matching genres in TV.app now, and the genre list gets quite long. I’d rather put only one or two key tags into the Genre field and then put less important ones into the Grouping field, but for Plex to see all of them and make them available as ways to link similar movies together.
The problem is worse with music, since there are no tags coming from Music.app at all. I have Genre and Grouping tags set for many of my files, but still nothing comes across, so I can’t even use the long Genre name hack here. As with movies and TV shows, I’d prefer to put detail tags into Grouping rather than Genre.
As an example of a song tagged like this, I might call the Genre simply “Electronic” but in the Grouping put “Dance, EDM, Disco” to make finer gradations of discernment. You can think of Grouping used this way as a “subgenre” field.
Splitting should be done on comma, semicolon, or slash.