Somehow a vertical video I shot was saved upside down. The phone was not upside down when I shot it.
Anyway, I want to rotate it to it's correct orientation. It was suggested iMovie iOS could do this. Aside from using iMovie on iPhone for the first time and finding the interface abysmal and far from intuitive, it appears that it can not do this. Anything I do in iMovie ends up cropped to a square.
How do I flip a vertical video on the iPhone without a 3rd party app?