Hello, I still like to check into this Forum a few times a week to see what’s happening…
From your short comment, I think you are seeing some dot-underscore “._” files. These are created by Mac OSX when copying files to a FAT32 drive. I like to use the OSX app “HiM” to delete these files as the last step in file management with my Clip Sport or Clip Jam. Here is a weblink to read about the HiM App.
https://www.macupdate.com/app/mac/52076/him
As for your question about Playlists, maybe take a look at my comments in this message link on this Forum.