I'm afraid it is currently not possible to upload an avatar for rooms, only for users and the group account itself. This is known requested feature, but I can't confirm if it will be available soon. Although feel free to vote and comment for it at:
We've partnered with Slack and are working with them to build a migration program to help customers easily make the move based on our announcement here. Your investment in business communications and modern teamwork experience will continue to reap benefits on Slack.
Our customer service and support team are here to help you through this transition if your group wants to. To learn more about next steps and other information, please read more on our Migration Hub.
Due to this partnership, we will only be fixing critical bugs in HipChat and Stride. This means new features won't be added to the product.
Let me know if you have additional questions.
Earlier this year we made the difficult decision to discontinue our team messaging tools, Stride and Hipchat. The end of life date for Stride and Hipchat Cloud is quickly approaching - February 15, 2...
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