Design a prototype for a multi-user collaboration tool within [ProductName]. The prototype should demonstrate how multiple users will interact with the tool simultaneously, focusing on key features such as [CollaborationFeature1], [CollaborationFeature2], and [CollaborationFeature3]. Ensure that the prototype allows for real-time updates and collaboration between users. Output the prototype in a sharable format for both internal and external user testing, and include feedback mechanisms within the prototype for gathering real-time user insights.