Export video to Live Photo So everywhere I see how to convert a Live Photo into a video or a gif, but how do you save a video as a Live Photo? 

The goal here is to take a video and make a Live Photo for use on iOS lock screen.
intoLive - Live Wallpapers app is the app you are looking for.

It takes a video and exports it to Live Photo which can be set as video wallpaper on supported devices.