Welcome!

Portal is a Game Object - it can't be an (1) NPC, (2) Equipment, (3) Inventory, or (4) Ground Item, which are the alternatives for interaction. It has worked, but again, is pretty inconsistent.

I noticed it can struggle to determine nearby objects as "visible." This happened when I tried to automate Rune Essence mining - it would consistently fail to notice the portal, even when visible and within 2 tiles. Besides this, it's worked really well. It'd be nice if it could be formatted...