I take it that 'Google' here is the 'platform' referred to in the first item above. 'Any issues with playback should be addressed to Google'.'paid movies and TV shows can be saved for offline viewing on your Android, iOS or Chromebook device' provided there is a 'Play Movies & TV App on your device'.'paid content uses slightly different technology unlike free videos', but that.
I complained to Metrodome / YouTube who promptly refunded me, but with a variety of explanations: mp4 at the top of its list of playable formats.
But I play them back on Quicktime Player which has. mp4 being my usual download format, though I usually download them using DownloadHelper. mp4 file, but was told that my Quicktime Player couldn't open it.