How do I get an active thumbnail for a gif I post?

I see some people who post GIF files have their thumbnail showing the active Gif. How do you do this?

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I've only had success with posting links to animated WebP files, which preview and display correctly in the default web UI. It doesn't seem to work perfectly across the variety of apps and their handling of images though.
I think @NotAGuyInAHat mentioned that they use EZgif to do it. I generate them locally with FFmpeg, though that's a little technical.
- Thanks for the info!