Here are 3 ways to post GIFs to Facebook.
https://learn.g2crowd.com/how-to-post-a-gif-on-facebook
Pro Tip: Be sure to post a link back to the full video or video library on the Facebook post.
For example, if your video is “Title Insurance Explained Visually” then you’d want to include a link back to the page on your website that corresponds with that video.
This is usually something like [yoursite.com]/title-insurance-explained-visually or [yoursite.com]/video-library for a full list of videos.