The location of the root scene does not change unless you specifically change the actor location. Everything inside the actor with physics enabled will only update it’s own position and all it’s children, the root of the actor will stay stationary, as will all other components in the actor.
So if you have two physics enabled objects in an actor you should regard them as two seperate entities that have their own location.
In your specific case, you probably want to attach the camera to the playermesh (camera should be a child of playermesh). The the camera will move along with the playermesh.
Another thing: if you want the actor to move along with something that has physics enabled, then that physics enabled component should be the root of the actor (delete the root scene). So if you make the playermesh the root component of the actor, then everything else will move with it.