Cannot delete file at iOS

I create myVideo.mp4 in File.documentsDirectory at iOS. I can see it in the Images and it works.

When I try to remove it (moveToTrash() || deleteFile()) I get no error with try-catch.

When I try to remove it (moveToTrashAsync() || deleteFileAsync()) I get event complete.

When I ask if exist I get false. Everything seems fine but video file remain there!

Any idea why?