That could easily be why. Just put it in ringtones without any containing folders and see if that works. I had thought that m4a rings would be able to be put anywhere, but for some reason it wasn't working unless i just put it in ringtones. Mp3s didn't seem to have that issue. Dunno why. That said, I wouldn't suggest converting it to mp3 because converting lossy format to lossy format could lose even more quality.