This is a great app, and I use it all the time. I just got a car with Android Auto, so I've downloaded a few albums to use in offline mode. They've worked well when I played them on the phone just after downloading, but for some reason by the time I get around to trying them in the car the local files have disappeared. The album names are still there, but they all have zero files. The first time I noticed this I downloaded the albums again, but the files disappeared again. Am I doing something wrong, or is there some kind of "cleanup" setting somewhere that I should disable?