I don't have an iPhone I connect to the car, so, I cannot test. But, CarPlay does seem to take over everything it can. If hitting the "media" button and picking the USB stick doesn't work, or, results in CarPlay taking over the media connection again, then, yeah, sadly, that's an Apple-ism, just like CarPlay overriding Android Auto connections (rumor is, it's a requirement in the license to implement a CarPlay compatible head unit).I’ve found that I lose access to my USB drive when CarPlay becomes active. Is that abnormal?
I had the same thing happen to me! I wasn't using AA and a Friend plugged her iPhone in and the car ignored my phone (android) and saw hers! We even switched ports and it still happened.I had my phone plugged in to the lower USB port in the center console. Using Android Auto on the way home. My wife plugged her charger into the upper port and it disconnected AA. Normal or do I have an issue?
I purchased a new Ipod for carrying my tunes to the car but unfortunately that overrides the phone which use for navigation. Also having issues with the phone not connecting occasionally, love the car but sometimes not the user interface.With Android phones, there is no conflict between AA and a USB stick with music on it. I keep a 64GB drive plugged into the top port all the time, and I can get to my music even when AA is running on the bottom port. I keep an additional cable plugged into the USB port at the back of the console for charging other phones. You could also get a "charge only" USB cable for the second front port to avoid conflicts.