Hi, I have the same question, as I always assumed that the 300R didn't have a resume function, but I didn't really mind it. Unfortunately, I don't understand the answer. How do you exit using the back button, and what is "Exit entry in the slide out menu"?
Sorry to be so dim....
The default music player supports resume, this is regarding the usb audio player app, and what they mean is that you keep pressing the "back" button in the player until the exit prompt pops up. If you do this before shutting down the player, the next time you start up the UAPP it will resume where you left off.