According to the Harmony 12 manual, you can import from a scanner, under File > Import > From scanner.
In my Essentials trial, that choice doesn’t appear.
Is just it blocked in Essentials? Or is it not in the other versions of Harmony either?
As far as I know, Trial versions are fully featured and do not have limited functionality.
“File > Import > From Scanner” should be available
in all three versions of Harmony: Essentials, Advanced and Premium.
Do you have a scanner connected to your system ?