After doing some research, I'm pretty sure this only works with Apple products connected via a Lightning cable.
I have an iPhone 5s connected via Lightning cable and everything works as expected.
My 3rd generation iPad connects to the computer through Apple's old cable (30-pin to USB Cable) and it does not appear as I was expecting.
From my limited tests, it appears that your apple device must be connected via a Lightning cable. If your device is older than the Lightning cable technology, it appears that you are out of luck.
... Hopefully I'm wrong... but I don't think that I am.
Cheers