GroupActivities / SharePlay Build shared real-time experiences using the GroupActivities framework. SharePlay connects people over FaceTime, Messages, AirDrop, and nearby visionOS sharing, synchronizing media playback, app state, or custom data. Contents - Setup - Defining a GroupActivity - Session Lifecycle - Sending and Receiving Messages - Coordinated Media Playback - Starting SharePlay from Your App - GroupSessionJournal: File Transfer - Common Mistakes - Review Checklist - References Setup Capability Add the Group Activities capability to the app target in Xcode. Xcode adds the required…