Hi guys.

I'm trying to render some droplet in a glass bottle.In render view,I can see them,but if I export to PNG,it won't show up ( it's fine with jpeg) . However,I need PNG image so I can composite later.

And you guys can see at outer edges,they are black.

Currently,I'm using mia_material_x with water preset for the droplets,and they are nparticle.

Here is an image about this issue.
https://imgur.com/a/kIuoj

(Sorry for my bad english)

Thanks !