Okay, so: I picked a GIF at random from my "reaction gifs" collection, it's this one: <a href="https://i.imgur.com/0NWbSL1.gif" rel="nofollow">https://i.imgur.com/0NWbSL1.gif</a> I copied this from Chrome and pasted into Discourse, sure enough it's a JPEG. Is it just Discourse? Let's find out. Chrome, right-click > Copy Image, paste into GIMP. One pasted layer, it just grabbed one frame of the image. Copy Image, paste into Gmail, which I know for a fact supports animated images. Same thing, a static frame. I find this page: <a href="https://www.reddit.com/r/chrome/comments/21bh5d/how_come_chrome_cant_copypaste_a_gif/" rel="nofollow">https://www.reddit.com/r/chrome/comments/21bh5d/how_come_chrome_cant_copypaste_a_gif/</a> While not the most coherent post available, the gist is "the OS clipboard mechanism doesn't work like this", so it's very unlikely that you'll be able to copy an image directly. You can still copy-paste the URL, save and upload the image, and so on - in fact, pasting the image URL directly into the editor worked just fine for me, and was as fast as copying the image. TL;DR: this is probably not going to work anywhere, and it's probably not something I can fix in Discourse.