.mov transparency issue in Premiere Rush on iPad

I use an animated lower third .mov in Premiere Rush for my lower thirds titling. It is on a transparent background, and then I made a mogrt file for the text and I just match it up with the .mov.  It was part of an elaborate workaround since Rush won't use a motion graphic made in AE.  When I import on the computer, it works fine in Rush.  On my iPad, the .mov shows up with a black background. I have an iPad Pro running iOS 13.6.1 and the latest update of Rush.  Can you help me out?