Did you try it with the WebRTC or the app recording? Just as a reminder when the app starts the recording it will allow you or disallow things based on its own preference.
With WebRTC however you should be able to do more and the pause is actually only available for the WebRTC recordings.
This goes for both WebRTC and WebRTC Streaming.
*For iOS I would still suggest checking on Chrome or Firefox. If you do test it out on Safari, it will need to have all the parameters set right for it to use WebRTC recording.