Yes, unfortunately when I try via the USB, the Samsung music folder is populated with hundreds of individual artist folders. I currently have over 1500 tracks on my phone and trying to add another 700. I would have to cut and past each artist tracks from my computer into their corresponding files on the phone. Probably an 8 hour job 🙂
As for the phone, mobilego worked with my previous phones (same carrier). Not sure why its not working with the S6 edge. I wonder if it has something to do with not having a SD card?