I'm trying to play music via OTG and a USB thumb drive into my S7.
I have the proper cabling and the files show up just fine but only one selection plays each time.
How do I get a "play all" result?
You'd need to add all files to a Playlist, otherwise it just plays a single file as it's doing so from an external storage location. Or use a music player app that supports automatic play from external file folders.