I had the same issue, and not matter what i tried none of my songs added even trying one at a time. I eventually created a new folder on my iPad and put all the files in there, then when i imported them via Stagetraxx it imported them into the stagetraxx folder and everything worked. I also tried with MP3s but had to do the same work around to get them into Stagetraxx. No big deal to do it, but just in case anyone else was having issues, then this worked for me