Thanks so much for all your help on this! I’ll answer backwards.
I am using sync manager. If I don’t everything DOES work (because I’m basically duplicating my external drive into the internal one in the player), but it overwrites any streaming song scan data that is on the internal drive.
So, in sync manager, on the left side it shows the main collection, and on the right side is the external drive. The playlist that’s on the external drive doesn’t show up in the main collection, and I obviously can’t have two external drives open on the right at the same time to sync between.
I’ll also add that I am creating the playlist ON the external drive. What I mean is, in engine prime there are also two panes, main collection on the left and external drives on the right. If I make the playlist on the left side it doesn’t show up when I plug the drive into a different computer (I believe if you create a playlist in that left “main collection” pane, even if all the songs are stored on an external drive, it still stores the metedata in the database on your computers main hard drive.) If you create a playlist in the right pane that lists your external drives, it will show up on other computers, but in that right pane (coming back around to my issue). I created the playlists on my desktop, and then tried to use my laptop to copy the playlists onto the players internal drive.