I m very new to Ros and I m trying to understand how to work with it ( https://thangs.com/designer/HowToMechatronics/3d-model/Robotic%20Arm%203D%20Model-38899 ) I wish to work with this above robotic arm but I m unable to grasp what is right way to export this arm file for simulation in gazebo. Any resources on this would be helpful!