Worksession attached file scale settings

Hello,
I have a problem with referencing Autocad drawings into Rhino.

with a command: “!_-Worksession _Attach _Browse _Enter” I used to attach Autocad DWG into a Rhino file and there was a window where you could specify the units of the attached file.
the window is not available anymore and there is no way how to specify the scale of an attached file.