I know nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z made a work around where you can upload gifs as emoji packs

So you can go to emojito.meme and add gif/meme URLs to an emoji pack, publish the event and then it should be available in amethyst