ffmpeg - Turning a series of PNG files into GIF with black transparent background - Super User

I have a series of RGB PNG images and I'd like to turn them into a single animated GIF file with black=transparent. The following command was recommended elsewhere, but it doesn't seem to turn the

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GIPHY Engineering » Modifying FFMPEG to Support Transparent GIFs » Modifying FFMPEG to Support Transparent GIFs

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GIPHY Engineering » Modifying FFMPEG to Support Transparent GIFs » Modifying FFMPEG to Support Transparent GIFs

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