playlists on usb not playing on iPhone

[Hines_Fire]

I have saved playlists to the phone via WiFi and they work fine. But I quickly use available space on the phone.
Saved mp4 files to a usb which work fine-the share to vlc pops up and it plays no problem. But I cannot get a playlist saved to the usb to work. The folder opens and I can play individual mp4's one at a time but it will not continue to play all items in the playlist. The documentation states at "Media_grouping_in_folders" that folders act as playlists in VLC for iOS.
Am I missing something or is this just not available?
My phone is iPhone 11 iOS 15.3.1 with VLC for Mobile 3.2.13

[bubu?]

Currently playlist on usb are fully tested and working.

By importing the playlist and the associated media files, it should be working as expected.