Not sure if anyone can help, but I'm looking to see if it's possible to do.
Can I have a group of layers in Photoshop, fill the entire canvas with a color and have it only show on the children of that group below the fill layer?
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Sure; use a Clipping Mask.
Take your group...
Create your fill above the group...
With the fill layer selected, either go to Image → Create Clipping Mask, or simply alt+click directly between the group and the fill layer in the Layers panel.