I have a USB stick on which I've added all the music that I listen to. There is also a playlist. I was so disappointed after plugging it into my current cars USB, it will not use the playlist. That was years ago, and maybe the new cars are doing it now, but I doubt it.
1st make sure I can plug in my stick and have it play the music (have alphabetical as an option)
2nd allow me to select a play list to play.
3D remember which one I used last, preferably where in the list I was, then start over at the end
I like 4+20 years ago, but I am sick if it playing every time I start the car, followed by A good Hearted Woman