Flat conveyor belt simulation in MSphysics

My purpose is to simulate the flow of multiple objects over a flat belt conveyor. I created a simple model of flat belt conveyor. Then, i set the states for the conveyor frame to be static. Applied motor joint to the conveyor drums. So now when i play the simulation, the flat belt just drops down and doesn’t move around the drums. How do i constraint the flat belt so that i moves around the drum and the objects that i put on it moves forward with the belt