Send Animated GIFs
Another option you’ll see when clicking on the Apps button to the left of your text field is the same “#images” option found in the iPhone and iPad Messages apps, and it works in pretty much the same way.
You can scroll through and select from any of the GIFs that are displayed by default, or type something in the search box to narrow down your results to a specific theme. When you find one you like, just click on in to paste it into the message field and hit “Return” to send it on its way.