Apple has recently published a support article for system administrators regarding APFS and macOS High Sierra. Still, it’s possible to share tracks and collaborate with other musicians, despite a few. For this article, I couldn’t get GarageBand sharing to work flawlessly every time.
But hey, you can now use the Music app for that. Alas, the Remote app still ‘saw’ my music, but it didn’t do anything when I clicked on a track or an album. I turned on Media Sharing in System Preferences and tried to stream my music.
After making a backup (!) I upgraded my Mac Mini to Catalina.