If you want your class to take lifetime ownership of this interface, i.e. you do not want the garbage collector to destroy the actor while your class holds a pointer to it, then store it in an UPROPERTY() UMyInterface MyInterface;* in your class.
If you want your class to take lifetime ownership of this interface, i.e. you do not want the garbage collector to destroy the actor while your class holds a pointer to it, then store it in an UPROPERTY() UMyInterface MyInterface;* in your class.