Hello everyone. I'm new. I've had an Ioniq SE Premium since July this year (2017).
I was frustrated by the way the car places mp3 files in a different order to the order in which they were stored on their original albums. That's not a big issue unless, like me, your music includes some classical pieces that really need to be played in the correct order.
After a lot of faffing about with the files' metadata, I eventually discovered that the car places some album files in alphabetical order using the track TITLE and not the FILENAME, ignoring the track number too just for good measure!
Folders also seem to be unnecessary provided the mp3 files are tagged with an album name.
Now that I know this, I edit all of my mp3 files' metadata (MediaMonkey is excellent for this) before I save them to the usb stick.
By placing a number (two digits - 01, 02, 03 etc.) in front of each track's TITLE (not the filename), the problem is solved.
I've also found that it's good practice to format the usb stick before saving new files to it.
(Remembering to have the files backed up elsewhere!)
I searched several forums for a solution to this problem but found nothing. I just had to figure it out for myself.
I hope this is useful.