Layer blend
All layers can be blended; this is necessary for mixing multiple textures—for example, when you want to blend a wood texture with a stone texture.
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Add two layers; I’ll have one layer of wood and another of stone.
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Select the second layer and set its Blend Mode to Overlay.
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Everything is working! You can experiment with different modes, as well as enable or disable various RGBA channels on the textures to achieve the desired effect.