When I was attempting to upload new MP3s to my micro SD card (along with .m3u playlist files), I found that my playlists in Samsung Music don't populate at all. As well, under Settings/Sounds and Vibrations, all choices of the default Ringtones and Notification sounds have disappeared. I have tried to clear cache and data of Samsung Music and Media Storage to no avail? Any ideas? I have an app called "media Re.Scan." but it doesn't seem to work.