GIF with transparency output not as expected in GIMP - Graphic Design Stack Exchange

I have been trying to create a GIF using a sequence of PNGs within GIMP An example PNG from the sequence shows the correct transparency I want to be shown in the GIF, But when I process the PNG

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GIF with transparency output not as expected in GIMP - Graphic Design Stack Exchange

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GIF with transparency output not as expected in GIMP - Graphic Design Stack Exchange

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How to make a GIF with a transparent background?

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