I tried to add another map for a second floor. After some researching, I found out that there should be a multi-floor section on the app to add another map. But in the latest version of the iPhone app (German language) there are no sections or buttons to add another map or any settings to enable multiple maps. I can only edit the map created by the Z60 during the first run.
How can I enable multiple maps?
Thank you. The option was missing in the German version of the app. After changing language to English, the option was there. As I noticed today, the option now remains even when switching back to German. So the problem seems to be resolved.