MobileMoviePlayer

Anybody tried the new MobileMoviePlayer?
I have an older project in which I use the iOSHTMLViewer to play a m4v video. Just tried to change to the MobileMoviePlayer on 2020r2.1. Get spinning wheel within the control but no movie plays. Checked on simulator and with built app. There are only 2 lines of code so don’t see what I could be doing wrong:

player.LoadURL(f.URLpath)
player.Play