When inserting large raster images from online sources or Pix4D some users report seeing the error message "External Reference missing" after specifying the import options. No frame is created and the drawing is not visible.
Type FASTIMAGEDRAW in the command line, set the option to 2 and create a new drawing. Import using the same steps as before.
While you're at it, set the option REGENTOOLTIPS to OFF and you won't need to manually regen every time you zoom in your drawing.
James Johnston
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