How To Use Optical Registration?

Hi,
I want to scan drawings into Toon Boom Harmony Premium 16 without taping pegs to my scanner, and I can’t figure out how to align the peg holes. The little information I could find online seemed to suggest the optical registration was an automatic process, but Harmony fails to align the peg holes when I scan my drawings into it using Import>From Scanner. Is it possible to align the peg holes in Harmony, or do I need some kind of third party software? I’m on Windows 10 btw