answer from DJI
Hi, thanks for the inquiry. Yes, the secondary could take over the part on controlling the aircraft if any case that the primary RC will not work properly. You still have telemetry and live feed on your secondary mobile device as well. For additional information, our team is currently working this feature to be available on iOS as well. In any case that this would be available for this said type of smartphone, our valued customers should be notified. Hope that this information would satisfy your query for today. Thank you for continued support.