Why not just plug it straight into the USB port inside the Glove box
without an adapter ?
Plug it in while the radio is switched OFF ( or Ignition Off ),
amd then aftwr turning ON, give the system a few seconds to read the files before you try and play them.
Select the Audio Source as USB and you should be good to go !

( Or if not come back and explaiin what any problem is ! )
Cheers

