You can also find Live Photos in the Photos app and add the bounce effect to make your Live Photos play forward and then in reverse. Follow these quick steps:
Step 1: Navigate to the Photos app and select the Live Photos album.
Step 2: Select the Live Photo you want and open it to bring up the interface.
Step 3: Tap the Live Photos button in the upper left corner of the screen.
Step 4: Swipe up and select Bounce from the effects toolbar.
Step 5: To finish, select Done.