Found a suspicious file on my phone

Downvote me if this doesn’t belong here, but I have no idea what to do or think about this.

So I was looking through my phone and found a video file that started with “MVI_” and then a series of random numbers. I clicked on it but it wouldn’t play. Then the file must have disappeared because I couldn’t find it again. I don’t know what it is or what it could be but it makes me nervous. What could this “MVI_” file be??