Rivian R1S and R1T owners can now access native YouTube, Google Cast, and SiriusXM in their vehicles.The features are part of the latest software update, available for both pre-facelift and updated models.The update includes a native YouTube app, native SiriusXM app, and Google Cast functionality.The YouTube app and Google Cast functionality are part of the Connect+ technology package, while SiriusXM requires a separate subscription.