Since you can print documents, and Photoscape has no printer listed, makes me think there is some group or permission that did not get set when Photscape was installed.
Doing some googling while drinking it seems Photoscape is a snap, ugg. F'ing snaps.
So the issue would be snap is not allowing the app to see the printer, because it's a f'ing snap.
https://askubuntu.com/questions/8864...nt-see-printer
From the above link they recommend the following command, edited for your use. But that link is 4 years old so not sure if snaps still work this way. f'ing snaps
Code:
sudo snap connect photoscape:cups-control :cups-control
