I've searched around here and found that the "update" from Android 9 to 10 breaks Playlists - the songs copy ok to the phone when syncing from MusicBee but in the phone's native player (Samsung Music in my case) the playlists are empty (0 songs). There are multiple posts here explaining how to fix by hacking the .m3u file to add the full file pathname - but this presumably needs doing every time you re-sync any changes to the playlist.
My own workaround has been to start using Rocket Player on my phone, which being its usual brilliant self has no trouble and "just works". However, it has certain user aspects I don't get on with that much. Another fix I believe is to update Android to 11, but I'm holding back on that since there seems no other reason (other than this) to update and I am by nature a late adopter, by experience and often for good reason. e.g. I don't actually know that on my Samsung the problem is fixed - it seems to be a generic Google fix; whether Samsung adopt it, who knows?
So, question is: is there a way using Music Bee to get around this issue? I've tried the usual - different file extensions, playlist locations, relative paths, and ensured I have the latest MusicBee. I did find a zip file with a MusicBee patch but I don't know against which version that was so won't attempt that (for now) or if it will work with current version (
https://getmusicbee.com/forum/index.php?topic=31225.msg173028#msg173028 ).
Any wise gurus out there? TIA