How can i export this with a transparent background?

[pseudo tendon]

I purchased an asset pack. The vfx are set to linear dodge (Add).

How can i export this vfx with a transparent background? The black is seemingly baked into the vfx

[ancient vector]

Blending modes are dependant on the layers underneath (including a background) if you export them withouyt that background, then the blending mode doesn't work anymore. The blending mode is always "baked" into an export.
You will need to reproduce the effect using either another method than a blending mode, or export it with the end-use background already in (but not with a transparent background)