How to make a second floor on Home Design 3D?

I downloaded the app "Home Design 3D for Iphone" from "Anuman".In the furniture menu there are stairs. I put them in my house and tried everything but it won't let me make a second floor! I have looked everywhere, please help!

Judging from the trailer I saw on youtube, it's not possible.
Just create another project and design your 2nd floor there. Maybe you can duplicate the 1st floor, then change it around?

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