Unable to place objects on static mesh

I am unable to add small object on top of static meshes. I have turned on “Complex Collisions” . Watch the video. https://www.youtube.com/watch?v=KrzfRhaaEbo
The static mesh was created in Maya and exported as FBX. The little cube only appear on top of Megascan meshes. Not to my static building.

double check if Collision Complexity is set to “Use Complex Collision as Simple” from your mesh panel detail., and view it complex collision if it correctly made.

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Yep one or the other mesh doesn’t have collision.

Also could be the pivot point of the thing you are dropping is way outside the object. AFAIK the editor drag and drops the object’s pivot point to the surface under the cursor.