Ok, Epic left out some info about interfaces or it’s hard to find.
TIP: If you create a function inside an interface, it will be available as a event(like a custom event).
-Anyway, I would create a interface function with a enum output link. Then, in BP that uses it, create an enum variable and connect it to the interface function enum output.
-When you call another’s interface function you need to have a target. The easiest way is to use a overlap collision and use the actor it overlaps as a target. Anyone who calls that interface function can get the enum.
I wish I had images. lol.