I cannot rotate MP4 files from my phone or tablet in Movie Studio with the app crashing. I get sent videos from other folk created with their cameras that also cause the problem. Every other video editor I have on my system has no problem rotating the videos. I have to edit them externally and re-import them which means I lose quality and time. This has been the same for the last few versions of Movie Studio for me. How is it for everyone else. If it works for you, how are you rotating them?