This will create a new image, use Filters>Animation>Playback to check it. Image>Interleave layers>Interleave single layer (sprite mode) and select the white layer.Add a layer filled with white (or your new background color).Dark grey can darken to black, but don't panic. Colors>Color to Alpha All layers and remove the background (color-pick, it should be #EEEEEE).Change image to full RGB: Image>Mode>RGB.This create a new image, you can close the source one. Remove the optimizations: Filters>Animation>Unoptimize.But in a GIF, there are no partially opaque pixels, they are fully opaque or fully transparent, so you can't have shadows. In the picture above the shadows would be implemented as partially opaque pixels, that would slightly darken the pixels of the background. When you want a transparent background, you want to be able to show the picture over any background. Then a transparent background is not doable for this particular GIF. It depends if the light gray things are shadows or not.
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