Opened up the non-snap version
gedit ~/.local/share/applications/org.ksnip.ksnip1.desktop
Add %U after ksnip, such as this:
...
Exec=ksnip %U
...

Technical notes, and other ideas.
Opened up the non-snap version
gedit ~/.local/share/applications/org.ksnip.ksnip1.desktop
Add %U after ksnip, such as this:
...
Exec=ksnip %U
...