How to acquire the reference to a Niagara system in a Blueprint via C++?

Development Programming & Scripting
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Could you elaborate on this, especially how to do this in C++? I’m not even seeing a field show up in the Blueprint for my BeamParticles to apply that component to. (I’m thinking there should be like an empty slot that I can drag/drop the Niagara system I placed in the Blueprint to).

Thanks!