Rectangular rotation using stepper motor

I am trying to build a carousel style (belt driven?) system using stepper motor as shown in the pick. I want to be able to hold items rigidly and hanging vertically (like a rectangular shape that has a hole in it and in that hole there is a test tube). I have seen many videos but I don't understand how things are rotating. Is it the friction between belt and object or its something else.
For example this video ITALPLANT PBC 100 Carousel Type - RNA Automation Ltd - YouTube
SmartSelect_20211231-152224_One UI Home

The video shows the metal carriers attached to a belt of unknown type, attached at their vertical mid point. The carriers top and bottom are gliding in a plastic guide that keeps them vertical.
Are you attempting to duplicate this device?

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