I'm not sure I understand the question, as I'd say that's the only way to get paper in there. 🙃
The hatch at the front opens and you drop the sheets onto a loading ramp.
When the machine is fully closed as in the picture, there are no sheets loaded in the printer.
At home and in the office I have a Mac with Catalina and this printer! Everything works. In the office I had to download HP Smart from the Appstore and install it, then everything worked again.
If you know your rights as a customer, it is annoying in the worst case if you still have to contact the customer service to be able to use the device.
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Digitec (or any other Swiss dealer) is obliged to supply electrical appliances with a Swiss plug. If the appliance is supplied with a foreign plug, a suitable replacement cable should be supplied if the mains cable is pluggable or alternatively if the mains cable is permanently connected, a suitable adapter should be supplied.
If the appliance is delivered without a suitable plug, complain to the customer service and insist on a cable or an adapter, free of charge.
Info Digitec --> https://helpcenter.digitec.ch/hc/de/articles/4402084170386-Fehlender-Adapter
Point 1 --> https://www.esti.admin.ch/de/themen/faq/elektrische-erzeugnisse-marktueberwachung/