How To Create A Conveyer Belt Unity 5

Hello, I’m trying to create a conveyer belt for my game, I game looked around the community alot and have not been able to find a working script that works for me, sometimes it falls through the floor and sometimes it works but not in the direction that i want even if i rotate the object, and please no assets from the asset store, they just are outdated or paid

There are many different ways you could do this.

You could simulate it with a bunch of rigidbodies and joints in a loop and apply forces to move them around.
You could have a static collider with a frictionless material that applies a force to any objects that land on it at the contact position.
You could have a chain of unconnected but constrained colliders that you move manually in an update function.

It depends on what effect you want to produce and how you want to use it.