Man, this whole syncing system should be straightforward. Even wired sync gives me issue with playlists. It only copies the tracks of the playlist and not the playlist file (.m3u) itself. Even if i give the directory path to BlackPlayer's playlists folder it doesn't go there.
Sync would be useful if it copies the tracks to Music folder and Playlists to the android player's folder for Playlists as in my case it would be BlackPlayer\Playlists
Not sure exactly how you have your device settings configured, but Wired sync has worked fine for ages!!
I've never used the Android Player name, as I tried 5 or 6 different players before I settled on the one I use now.
This is how my settings are currently for my device "SM-J500FN" (Android 6.0.1), and all works fine on Wired and Wifi..
Storage path: [SM-J500FN\Card\]
Playlist path: [SM-J500FN\Card\Playlists\]
If I remove the "Card\" part - then music files are copied to the "Music" and playlists to "Playlists" folder the "phone".
I created those two folders originally using the device (Phone), although this may no longer be required as Steven, the MB and App developer, has made many improvements to syncing during the last few weeks..
Hope this helps, good luck.