Sounds like it's probably this:
"Compared to H.264/AVC, ie. the video codec that most camera apps on Android smartphones record in by default, Google says that H.265/HEVC can record videos at the same quality but with half the bitrate, resulting in significant file size reductions."
https://www.xda-developers.com/oems-...droid-12-hevc/
Apparently Davinci can't handle all h.265 files, and they have to be converted to DNxHD or ProRes format.