Lost mavic mini files

Hello everyone. First of all I’m super happy with the mavic mini. Just recently I realized all of my “old” videos I took are suddenly gone. I had to do an update and I’m thinking it’s maybe because of that. I’m really hoping somebody can help me out with what I should do because I really need those files for work.

You mention that you “had to” do an update. They aren’t mandatory if that makes any difference.
Hope you get your files back.