Gary, I'm not entirely sure, but, I think the file size has to be smaller than 20KB in order for the animation to work as an avatar. The one you are trying to get to animate is approx. 23KB.
I just replaced my avatar with an older animated one I did a few years ago to see if it still works as an animation. For reference the file size of my animated avatar is approx. 8KB.
Yep! Still works. See if you can somehow reduce the file size of your animation.
I hope that helps,
Harry
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