iOS / iPhone Instructions:
Live Photos for IOS require iPhone 6s or higher.
Download video files directly to your phone with the Imgur app. Once you have the app, it should allow you to “download image”.

Free apps, such as intoLive, will allow you convert video files to Live Photo. This can be used as live wallpaper.

Android Instructions:
I suggest to use the imgur app to download at the wallpapers at highest resolution. “Save video” for Android browsers will download lower resolution.

Video files can be used as animated wallpaper for most Android devices. If it is not allowing you to select videos to use as a wallpaper, you may need to use free apps, such as Video Live Wallpaper.