How come I cannot walk on my Static Mesh?

I’ve made a static mesh, but I cannot seem to get my character to walk onto it. I have set the collision to box type, and I have made stairs leading up to it. The blue part is a static mesh.

Is the blue mesh a Shapeplane?

OneProblem could be that you scale X and Y, but also Z.
If it’s a shape Z scale should only be 1 or lower
because higher Values of Z scale increase the collision box so you walk
like into a “wall”

Can you add a screenshot with the collision in your mesh editor (it should have a green outline).