On the 6s/6s+, we can use Live Photos as lock screen wallpaper, and a long press starts playback in the lock screen. This doesn't work on the SE. There is no "Live Photo" segment in the UISegmentedControl. I tried on a 6+ and it doesn't work on that either, but there is no Live Photo support in the camera of that phone so it kindda make sense. But the SE can shoot Live Photos, so it's weird to not be able to use them as animated wallpapers.