I'm having an issue with my final output not resembling my render. My render and what I want the image to look like is this:
But when viewed in other applications it looks like this:

I feel like I have some fundamental misunderstanding of the way transparency works in a PNG? Is there a way to fix this or is there a way around it? I want the 'aura' effect to fade into the transparent background as the image is intended to be overlayed on top of a different background.
Thanks in advance!
Blend file: https://drive.google.com/file/d/13iJBPP6R_dArTbBztFlpDa8Few34wvhC/view?usp=sharing

