ok. here is my simple question (new drone person) I replaced my first Mavic. however i'm trying to activate it and cant do it (or dont know how) on the DJI go 4 app that is already on my phone. The app appeares to still be looking for the other drone. how do i activate this new drone ? Do I delted the app and start again. I would have thought that the app would reconize a new Drone ? help please!