Thanks, Andre. I started to do that one time before the trial expired, but then I figured that would work but be an unacceptable workaround, although it would certainly work. Another workaround for the second aspect of my issues would be to use a high capacity SD card to obviate the USB mount. Trouble is, there's one microSD and 4 USB, one of which is USB 3.0 There are players out there that resume mode of operation and resume the previously playing track, I hear. Joying apparently has something, but it's not advanced like PA. I saw that in a android head unit forum, and the guy asked why it can't be done with other apps. Some apps can't see a USB storage device. Poweramp seems to be the favorite among car users, but many of them stream from the phone, or over Android Auto.
I'm not the only android car stereo user facing these issues, and the "best android car head unit app" is still a hot topic in the car world. The car android player is a unique application that has different ergonomic issues from phones and tablets. The most common items on the car player Android app wish lists are easier to see screen elements, bigger touch controls, and better menu navigation. Distracted driving is an issue, so swiping from page to page is better than ticcing the little menu "drawer" or three dot drop down, and then not being able to read it, anyway. If I knew anything about software development or the market, I would be out in front of the pack in this arena and charge double for the app!
I thought I'd make a little noise, here, to see where it goes. I think maxmp in post #2 has the right idea, and some head units for you , too! 🙂