Hi Hilami,
Thanks for the file. This could be done in the way I have described it above or with a different technique. I have sent you the file.
I was not sure if I can post the file here, please advice. Otherwise, I have to set up a new example to share it here.
The Cloner_ConveyorDyn in the file is the driving part. The visible Conveyor belt is just a Material tag> Offset animated texture.
Some areas would need a visual explanation of why it can move that way. Like blown air to move the package from one belt to the next.
Cheers, stay safe, stay healthy.