I want to accurately move some 3D modelling to linework in a linked .dwg file.
The way I want to do this is to snap the move command to point 1 and move the 3D geometry to point 2 -

As far as I can see I have snapping turned on:

I can snap to the linked dwg linework but not the 3D geometry.
Can anyone help me work out why?
TIA