try using media monkey or a specialist syncing app
I installed media monkey last night. and it's confusing figuring the sync out. I can't see a way to select which playlists to sync. it just syncs all of them. which isn't good because if i use it on my tablet it will run out of storage space for sure. And then windows did an update and restarted and then it took a few hours of trying to get the app to reconnect to the program again. the program kept saying it was disconnected or something like that. finally got it working and got the playlists synced. it put them in a different playlist folder so i have duplicates now. I just don't know what to do next time the app doesn't want to connect to the program on the computer again. I even closed the program out and reopened it a bunch of times. when i woke up from my nap it was connected again. bad thing about media monkey is it costs money for a bunch of features I don't have much money as it is. Plus the app costs money on top of that.
you mention a specialist syncing app. is there another app that would work with musicbee?