The markdown should look something like this:
![](https://some.website.com/your.gif)
You can even stack multiple images/gifs by repeating this pattern
PS: Jerboa might not display gifs accurately… Use other clients like Connect, Liftoff or Thunder or the Website/Webapp
Kbin has a boost “retweet” function whilst lacking a “save post” function Kbin naturally shows user karma whilst here, it is counted but not shown (some clients display it)