The avatar editor allows you to upload or import images, video, and audio files for your avatar, and tag them with emotions, actions, and poses. You can add as many images, videos, or audio as you want, and they will be randomly selected if not tagged. If tagged, they will only be used when the bot expresses the tagged emotion, action, or pose.
You should have at least a 'talking' pose tagged, this will be displayed when the bot is talking.