I was using sphinx to simulate the parrot bebop2 on gazebo. I wanted to add a platform on the top so I created a new .stl file and made equivalent changes for new joints to the urdf file in bebop_description in the folder bebop_autonomy. It didn’t seem to work, on running the .drone file, I am getting the original bebop2 drone without the platform. Should I make changes in the .drone file? If yes then how?