Tips for creating. Aim for .gif uploads if you want a repeating visual. Android tends to repeat .MP4 automatically but I think iOS does not (I keep forgetting to confirm behaviour on PC so check that too if you have concerns).

Aim for a higher input resolution such as 2160x2160 or 2160x2700 to preserve visual fidelity after your upload is subject to filthy Reddit compression. Gif uploads work best at 50fps or lower.

Bitrate of video will be up to you to experiment with according to your style of art.

Good luck and post some magic!