iMovie projects created on iPhone 4S or iPad 2 or later that contain 1080p HD video are not compatible with iMovie on iPhone 4 and iPod touch (4th generation). Such projects cannot transfer to these devices.
iMovie for iOS: Issues transferring projects containing 1080p HD video between iOS devices
iMovie projects that contain 1080p HD video clips, which iPhone 4S or iPad 2 or later support, are not compatible with iMovie on iPhone 4 and iPod touch (4th generation).
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