Learn how to build an iOS Siri Shortcut to create an animated GIF from a Live Photo. This can be tricky because you can't choose the image from a Share Sheet and you need to convert the Live Photo to a video first using Encode Media. But once you get all the pieces in place it is easy to set up the shortcut and have it ready to use. Then you can share a Live Photo as a GIF on social media.
View the shortcut