How to save where You leave off on iExpand

Hello I bought the 64 GB iExpand, and I put some audio booms on it. I want to be able to stop them and pick up later where I left off.

If i pause the song I can leave the app disconnect the drive and reconnect it and it will resume the file. If I try to do any other function like leave the now playing screen or try to copy pictures for example it will restart the file. Hope it helps.