I've only had my car for 2 days so I haven't had an opportunity to really try to troubleshoot this. When I picked up my car I plugged in a USB 3.0 drive that is formatted as ext4 and has a mix of FLAC and MP3s that are playable on my laptop. I am able to browse the drive via the touchscreen, but when it tries to start playing it says unable to play (both FLAC and MP3). I've tried several albums, artists, formats, all ripped at different times. Any ideas?