Just to elaborate on what hallux posted, you need to use a file manager app to find and then rename that file. The issue being, once you mistakenly renamed that file with just a period beginning it's name, that changed the file's status from visible to invisible. That's an established standard behavior with any operating system (Linux, BSD, Windows, Mac, Android, iOS, etc.)
Also, you will most likely need to go into the Settings menu of whatever file manager app you use to intentionally enable a 'hidden file/folders' option as most come by default with that setting disabled -- there will be countless numbers of hidden files/folders in your phone's integral directory tree with the intention purposely 'hiding' some files and folders from user interaction. Or in other words, don't just start randomly deleting or renaming other hidden files or folders you see as they're often necessary for an app or service to function. Focus on just that specific video file, and if you do feel compelled to just start deleting other 'hidden' files be very judicious and selective.
11-15-2021 02:58 PM