The recommended aspect ratio for avatars in bots is 1:1 (square). PNG is often preferred due to its support for transparency. Keep the file size around 30 KB to ensure fast loading times. Compress the image if necessary, but avoid excessive compression, as it can reduce quality.
If you're using the bot within Teams, check Teams channel settings and make sure to upload the icon there, too. The primary bot icon will not carry over to Teams.
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