Attach Files as Underlays

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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.