My render is working if i have a background but turns grey if i make the background transparent

I am very new to blender and am trying to animate some floating embers. I have managed to get the appearance i want and the camera angle where i want it to be. If I render it with a background, the shading and bloom works and the colour shows, but if i make the background transparent, the colour turns grey. I have tried re-doing the animation and i followed tutorials i found online but i cant figure out why its doing this.

Hi and welcome. Please attach a screen shot of your setting and UI to help us help you. also a link to the tutorial you used will help.
The bloom will only show once you add the background composed.

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