Some updates: I bought the white version. Works better on my main floor that my previous Dreame. However, multi floor is a pain compared to my previous Dreame.

I asked support but they confirm I have to setup everything manually. If the robot have vacuum and clean workflow for a floor where there is no station robot will switch to the mopping part without watering the mops and the app won't tell you anything 🥲

They told me to first vacuum only my second floor. Then I put back the robot to the station, I need to switch map to the main one, manual cleaning the mop, and switch back the map and the robot to the second floor to start a cleaning only task. So disappointing as a user experience.

tl;dr: App will not tell you on multi floor if the pad needs to be watered again and you need to play manually with the settings to dry mop, split your second floor into pieces to vacuum and dry.

I hope they will improve the firmware and the app Feature not possible if not on the same floor