There are multiple ways you can solve it, also depends on what do you want to do with it. For example:
- Animate a Skeletal Mesh
- Rotate the wheel from code, and apply a Panner material to the belt (and sync them together)
If you also want to physics bodies to be affected, there is an official tutorial for a conveyor belt volume: Making a Simple Converyor Volume | Live Training | Unreal Engine - YouTube