How do I enable shadow casting in Niagara fluid simulation in UE 5.1?

Development Programming & Scripting
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I’ve now got an RTX 30 GPU, but I see no discernible difference when ray tracing is enabled. I thought that maybe that shadow casting for Niagara fluid simulations would just magically start working. Is there something I need to do in order to enable that feature? Attached is a screenshot of the Cast Shadow option. I enable it, but there are no shadows.

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Besides shadow casting fluids, what other ways are there to test the RTX? Some people mention mirror reflections. I’m a total n00b when it comes to UE 5. 1, so what would be the simplest way to make a mirror?

Thanks for your time.

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I wanna know about this as well. Niagara fluid just dont cast shadow except for using path tracer option, which is offline rendering.