What do you mean by want? Can't you just upload gifs like this? https://image.nostr.build/cec6d4be63528eefb6bf47440f05d37b6b09d3ca40efd47794e0a1d907925316.gif
They want it to be in the composer I guess. Built-in
That's gay as fuck. Just save your GIFs like any other regular image.