Snapping models by dragging them into the scene isnt working on a certain mesh

Development World Creation
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1

Snapping models by dragging them into the scene isnt working on a certain mesh.

I have a mesh that is a boxed out rooms… for some reason when i drag new objects into the scene like furnutire… the pivot isnt snapping to the floors and walls… they just float through it… any idea why? It works on everything else.

2

For some reason remiporting with autogenerate collisions seemed to work… just had to delete the collision and switch back to use complex collision as simple… no idea why i was having a problem.