Contacted Apple support chat about this. The rep didnt really know the answer and went to find out a few times. He came back with IOS no longer records video in MP4 format. I asked then whats the difference between HighEfficiency and MostCompatible for videos? He said only file size., both save as MOV. I said that MostCompatible implies a different format which is compatible, which MOV is not, especially in Windows. Playing MOV files in windows either with Windows Media Player or the latest VLC player has many glitches, crashed windows several times and ended up destroying my Windows 10 operating system twice. When I then tried to avoid this by saving videos as MP4 I found it doesnt work and Apple support tells me its not possible anymore. For something that has millions of users, arent there many other users out there running into this issue ?