I'm a beginner, and cannot find the answer to this online. I've been trying to use the Clone Stamp Tool, but it only works on the background image, not on any layers. When I try to use it on layers, I press Alt and the target comes up, but then when I click to brush, it does not clone. It doesn't do anything at all. Any ideas on how I can get this to work? I don't want to edit the original image.
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