Opened up the non-snap version
gedit ~/.local/share/applications/org.ksnip.ksnip1.desktopAdd %U after ksnip, such as this:
...
Exec=ksnip %U
...KSnip Can Use SVG Stickers
Grab some samples here, download them and import them into KSnip
Install ksnip from a repository on Ubuntu
Issue
Using ksnip in Ubuntu parallels takes blank screenhots.
Solution
It's how the snap application is defined, it needs to be used in classic mode.
Refer: ksnip-screenshot-in-ubuntu
sudo add-apt-repository ppa:dhor/myway
sudo apt update
sudo apt install ksnip