I tested the left USB port today, the one with the white oval around it. Nothing happened when I plugged in my thumb drive, but if you pull down the screen from the top, it recognizes that there is a USB device plugged in. It gives you an option to "Explore" so I tried to play an mp3 file from the thumb drive. Nothing happened when I tapped explore. It didn't show any files, but there was a message describing the port as a USB drive for accessing media. So clearly the intent is eventually to allow us play our music or audiobooks, etc. from there. Volvo Consumer Support told me those two ports were only for charging our devices, but clearly this is not correct, although perhaps for now it is. Once activated, that will allow us to play our own music without fiddling with our phones, or even having them with us.