Only 2d assets work, but not 3d assets, just like in the screenshots.
When I edit the 3d one, nothing shows up in the screen.
Is there anybody who knows how to fix this? 
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Did you enable the fluid simulation plugin?
You mean Niagara Fluids Beta plugin?
Yes, of course~
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Having the same problem here. Basic Niagara emitters and the 2D Niagara Fluid emitters seem to work but the 3D Niagara Fluid template systems are blank.
Did you ever find a resolution?
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I have the same issue. I’m glad that I’m not the only one.
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我有同样的问题。我很高兴我不是唯一一个。
Did anyone post a solution yet?
I got the same issue and fixed it.
Open up the Niagara System, click the 3 dots besides Compile and hit Full Rebuild. Save it and it worked for me.
Thank you, that solved it for me. 
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i’m on M1 as well, still nothing but i saw someone else who has m1 and theres seems to work but mine for some reason doesn’t.
Nothing Still works, even with fluid one. I updated to 5.2 but still no change.
Sometimes making the size of the pool to a cube will make it visible and slowly adjusting the size will let you know what it can’t do. This niagara pool system is pretty ■■■■ put hey ho
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For 3D fluid simulation, I found out that my problem was that in the Niagara system editor, down on the timeline, I had start set to time other than 0. Setting it to 0 made the water appear.
However, I haven’t been able to get the 3D gas simulations to appear. Full recompile made no difference. I can confirm that 2D simulations work as expected.
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It’s because of landscape - try it with empty level and just put it on simple plane. Also you can try to disable “Use landscape collisions”.
In case anyone else has this problem: I found that deleting my Sky Dome fixed the problem.
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