The Dahua configuration was really no fun at first, but we figured it out. Also, I now have the technician's mobile number ;). He can remotely connect if necessary and fix whatever isn't okay (one of the two systems had a 0.00 firmware, so very old firmware and issues with control, which he completely fixed).
Of course, we also chose Dahua because of the price (less than 50% of the Goliath in equity).
In the app (DMSS), the camera's image is directly on the start page. However, then I need three clicks to open the door. The motor is called "Autotronic," installed in a Köster aluminum front door.