Hi, I am trying to import a video file that I dowloaded off youtube and converted to a .mov into iMovie. However, iMovie will not import it. It's not that it has an error when trying to import, it's that it won't even let me import it - the file is unselectable in the file browser for importing. I have tried to convert it to a .mp4 and that doesn't work either. How do I get this to work?