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https://www.apple1.shopping4all.uk/uncategorised/how-to-rotate-iphone-and-ipad-videos-on-mac-9to5mac
If someone shared a video with you or you accidentally took one in the wrong orientation, follow along for how to rotate videos taken on iPhone and iPad.
— Read on 9to5mac.com/2019/01/09/rotate-iphone-ipad-videos/