It's SIMPLE:
Goto > Folder that needs thumbnail pics,
Click > hamburger at top right,
Click > Preferences,
Scroll down to > Show Thumbnails,
Change selection to > ALL FILES
PRESTO CHANGO! It should work on Zorin OS Pro
It's SIMPLE:
Goto > Folder that needs thumbnail pics,
Click > hamburger at top right,
Click > Preferences,
Scroll down to > Show Thumbnails,
Change selection to > ALL FILES
PRESTO CHANGO! It should work on Zorin OS Pro