Playing IOS.MOV files on mac?

I spent almost an hour reading posts with similar topics but had no success actually finding an answer. I have multiple files, with names like date_numbers_IOS.MOV, 20191214_055450000_IOS.MOV. I want to try to organize everything and free up space but when I click on the filename I get an error re: this document isn't compatible with QuickTime Player. It's not like I recorded these with a non-apple device. Some of the other docs basically said that we need to analyze the file to determine what codec was used. These vids are from iPhones, Apple hardware, so I don't understand why I can't play them on my mac. I tried the right click/open with Apple TV, that didn't work. I tried the right click/Open with App Store and that just generated an error. I tried to search the app store for IOS.MOV, no results. I know that some of these videos are from once in a lifetime events, family gatherings which won't happen again due to deaths, furbabies playing who have also passed away, so any assistance would be greatly appreciated. NOTE: Due to side effects from something that was made almost mandatory, my income is drastically reduced so if at all possible I need a solution that doesn't require me to spend a lot of money.