I have the same tablet working flawlessly on Gimp (who needs Photoshop?).
The pentablet driver really doesn't works, but the open driver Digimend, works perfectly.
Download here: Release v10 · DIGImend/digimend-kernel-drivers · GitHub
Then install the driver: sudo dpkg -i digimend-dkms_10_all.deb.
Reboot Zorin OS 16.1 Pro.
After that, you have to create a script file to activate the buttons on the tablet.
More information here: How to Install DIGImend Huion/XP-Pen Driver in Linux & Set-up Express Keys - YouTube
Cheers.
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