Is there any way to insert a custom app or Adaptive Card to the right side of the Posts tab? I am searching for a way to extend the Conversation (chat) User Interface in MS Teams by adding contextual custom information in a panel to the right of the chat stream. I understand I could have a Bot in the chat that posts an adaptive card in the chat stream, but that will flow off the top of the screen when a few more users post messages to the channel. The screen real estate I want to use is the right-most area of the Posts tab ; currently Teams has a "Open channel details" button in the upper right corner of the Posts tab. That button opens a panel that displays info about the channel. That is exactly where I want to insert my customer UI elements. Research to date suggests the answer is no, neither the Posts tab nor the Files tab can be extended with customer Add-ins. Please comment with your insight. Thanks!
