How to Edit Live Photos
1 Trim and tweak
Select a Live Photo and click Edit. Under the picture, drag the yellow handles to change the start and end points of the video component. To change the key photo, drag the white square, then click Make Key Photo.
Got a photo that would make a great endless loop? Let Photos do all the work: switch the pop-up menu’s value from Live to Loop. Photos will stabilise and crop your Live Photo, to make it work as well as possible.
From the same menu, select Long Exposure to turn a Live Photo into a still in which moving water is smoothed or lights become trails. This works best if you use a tripod, as moving scenes will just blur otherwise.