I have an iphone 7+ 32gb phone. I wanted to take a picture today and it told me I'm out of storage. I deleted several video over 8mb in size, which should have freed up enough to take one photo, but after doing so, it still said storage is full. Why would that be? By my naive reckoning, it should have let me take a photo since there's no way a single photo could be larger than the several videos I deleted.