I don't know if this is where I should ask this but how do I use an animated sprite as the disc sprite? I made a glitchy disc that I'm really proud of but I don't know how to add it in.

The tool can't turn animated textures into Minecraft-compatible animated sprites, but you can manually edit your resourcepack after you've generated it. You'll need to format the frames of your animated texture as a spritesheet and create a .mcmeta file to tell Minecraft how to draw the frames: https://minecraft.wiki/w/Resource_pack#Animation