How to export glow without background for game sprite? [Animate Pro 2]

In Animate Pro 2, I’m trying to make a sprite of fire with glowy edges. Now when I export as png4, the glow around the edge completely disappears leaving a sort of dark edge. When I export as Jpg, the background is black, but the glow is there. I need to export the fire and the glow without any background. How can I do this?