The other day I created stop motion animation GIF using Google Slides - see blog post here. Leah, my wife who is a 4th grade teacher, saw it and wanted to know if she could use that GIF in classroomscreen. I knew that you could upload your own images, but never thought about GIFs. So, we gave it a shot and to our excitement - it did!
One thing that I did notice was that the GIF was a bit fast. So, we used Ezgif.com and then selected resize. At the top I then selected speed at the top of the screen.
Once the speed is the way you would like it, make sure to save the file and you are ready to go. Go ahead and upload the downloaded file Classroomscreen.
Embedded below is a GIF followed by a 34 second YouTube tutorial.