Attach Files as Underlays

You can display DWF, DWFx, PDF, and DGN files as underlays in your drawing.

Overview of Underlays

You can underlay and snap to 2D geometry stored in DWF, DWFx, DGN, and PDF files.
Attach, Scale, and Detach Underlays

You can add or remove references to underlays within drawing files, or you can change their relative size.
Work with Underlays

You can control the display of layers, use object snaps, and adjust display settings with attached underlays.
Manage and Publish Drawings Containing Underlays

You can view and manipulate underlays and change paths to underlays in the External References palette.