Cannot draw on the Oz dimension (Tried OSNAP) - autocad

I'm a beginner learning to draw with Autocad 2018. But drawing a house, I can't draw a door, a rectangle going up in Oz dimension. It's only allowed to draw in Oxy.
I tried turn on and off OSNAP (F3) but it did not work out.
Also I can't just draw a rectangle that starts from a line, it needs to be 2 lines.
Any help is appreciated. Thank you for your time.

I figured out:
You have to activate an option named "3d object snap". It's in the menu bar (bottom, farest to the right).

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