I noticed something like this with my first android (pulse mini) but ironically, I dumped them in the bluetooth folder and the player found them. I found this would work by going to the player and seeing what mp3 files it could see and then finding where they are on the phone. if your player shows an mp3 file, try getting to the file properties which should show where it is or browse until you find it. I guess certain players can only see certain folders and such.