I just added some new tracks to my phone's sd card and they don't show up in the music player. It's the first audiobook in a series that I hadn't put on previously because I wasn't going to listen to it, but I put 4 other audiobooks all formatted the same way on. I've tried restarting my phone,deleting the media storage, deleting non-audio files (i.e. album art), deleting large audio files, taking them out of their folder, and looking for them with multiple media players. The computer finds the files, the file manager finds the files, I'm at a loss. Please help! 