This MOC was designed to participate in the Eurobricks TC10 competition.
The video shows the functionality, it has been designed to be playable by a kid, so you can really dump and eject paper for example.
Since the model is done in LDD, the pneumatics cylinders have been replaced by brick assemblies and the tubing is not included. Check the pictures on Bricksafe to see the piping. For the ejector, it may be required to play with the chain position and angle of the gear to get the right extension.