Build level is not possible sims4 (ps4)?

Ac
- in PlayStation
3

I wanted to build a second level at Sims4 but for me it is not that I'm building a second floor. I've already looked at YouTube and everywhere but I can't find a solution. Does anyone know why?

Gr

Do you have a staircase that goes up?

Ac

No🤷🏼♀️must you have one there?

Gr

Yes. So you make the first level and then the desired stairs at the desired location and then the second level is automatically built