In GIMP, I want to use the bucket tool to fill in certain areas of my image, but I'd like to do it on an upper layer rather than directly on image.

I think I need to tweak some of the layer settings somewhere to get the bucket tool to recognize the borders of the lower layer, but I can't figure it out.

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    I'm voting to close this question as off-topic because it appears to have nothing to do with photography, but image editing software. – Tetsujin Mar 22 at 18:05

Found it. I needed to check the "Sample Merged" checkbox after I selected the Bucket tool.

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