The OpenTok Unity sample has been updated to support multiple platforms, including Android, iOS, Windows, and MacOS, without requiring any code modifications. This is made possible by bundling the supported OpenTok platform libraries with Unity, allowing developers to build applications or games that run on different platforms using a single codebase. The sample demonstrates how OpenTok's real-time communication capabilities can be integrated into Unity games and applications, enabling video calls and other RTC comms features.