When I try to load .mov files in the the PLAYR that have an alpha channel for a transparent background the video file won't play. Other .mov files work fine. MP4 files work fine.
I suspect it is an issue with the codec, but I can't figure what to use exporting from After Effects or Premiere to solve this.
*ok, looks like it works if I changed format to Quicktime and codec to ProRess 444