I could select the potion and select the enemy to use it on, but when I press confirm nothing happened.
Just tried it in game, and it's throwing an error - I guess I never actually tried to use potions XD. I've made a bunch of changes to the original game (and the potions are already fixed there) - so I'll transfer those over and update revenant once I'm done with the Stardander demo (have to get it ready for the Steam Next Festival).