can't render niagara with alpha channel

Hi. Anyone knows why particles in niagara system renders without alpha?
I render in png with Alpha channel clicked ON
Please any suggestions?

I’d been having the exact same trouble, and found that I was able to render some Niagara smoke with alpha if you put a colored solid behind the simulation. It can be a solid of any color, including black. However, when I imported the footage into After Effects, the alpha is reversed. I had to duplicate the footage, set one of the footage instances to ignore alpha, and then use the inverted alpha as an inverted alpha mask to get the correct alpha.

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HI , sorry for late response. Did you actually get the smoke/fluids to show up in the stencil alpha clip layers render pass ie deferred rendering? I have a solid behind mine and it doesn’t show at all. I’ll take anything… at the moment i’m having to use green smoke and key it out manually :slight_smile: