3 Tap the “Set” button on the settings page to download the wallpaper.
4 Set the wallpaper as your lock screen as usual. Make sure that the Live Photo playback button is enabled on the lock screen editing screen, then tap the “Done” button.
The wallpaper will not work unless the play button is enabled! If it does not take effect after you tap the play button, you can set the wallpaper again without any problems.
5 Complete! The wallpaper will now move every time you tap the power button.
If it doesn't work or if you want to customize the settings in more detail, check this out!