How to find all video files stored on Apple iPad Air 2?

On my iPad Air 2, i can see some video files when I go into Settings -> General -> iPad Storage -> "Review Personal Videos". And I can play the videos, so they are really on the iPad somewhere!

I would like to copy these videos to my PC as there are some precious ones.

But no matter where I look on the iPad I can't find these videos. For example they are not visible via the Photos app.

How can I locate them and for example share them with Google Drive?

They are also nowhere to be seen when using the most recent version of iTunes.

Thanks for any help!

[Edited by Moderator]