Hello MadPropz101, as you may know, gifs aren't great at handling transparency, Alpha threshold and Alpha dither advanced settings in Spine 3.7 should help you find a better balance, you could also export a PSD, then use Photoshop's exporter to control settings better.
I tested APNG format and a transparent video in PPT, but both seem to be unsupported by it, otherwise I totally would have recommended either of them since the quality would have been higher.

Erikari wrote

you could also export a PSD, then use Photoshop's exporter to control settings better.

Photoshop has a few GIF settings Spine doesn't: diffusion/pattern/noise dither, web snapping colors, interlaced, lossy output, and some options for how colors are reduced. However, most of those are not typically very useful and Spine has many useful controls that Photoshop is lacking. :nerd: