Attach, Scale, and Detach Underlays

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Concept

Procedure

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

Attach Files as Underlays
You can attach a DWF, DWFx, DGN, or PDF file as an underlay to a drawing file.
Detach Underlay Files
Underlays that are no longer needed can be detached from a drawing file.
Unload Underlay Files
To improve performance, you can unload underlays from a drawing file.