Underlays Overview
Add an image or PDF as a scaled reference behind your drawing.
Underlays let you draw against a source plan without turning the source into editable drawing geometry. Their scale and alignment affect how useful they are as a reference; confirm a known distance after import.
Load a reference
Choose Import → Underlays in Design. On File, browse, drop or paste an image or PDF. You must be signed in to create an underlay.
Adjust and calibrate
On Adjust, crop, rotate or adjust the image. On Size, set a physical size or calibrate two points against a known distance. Review position and rotation so the reference aligns with the drawing.
Create the underlay
On Finish, check the summary and create the underlay. It appears behind the drawing and is managed separately from drawing objects.
Manage the reference
Use the underlay controls in Layers to show, hide or adjust the reference. Underlays are not normal selectable drawing entities. Check the options in the specific export workflow before assuming whether the reference will appear in output.