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How Do I Copy A Layer Mask To Another File? [Solved]
To move a Layer Mask from one layer to another, click-and-drag the mask to another layer. To copy a layer mask to another layer, press-and-hold Alt (Mac: Option), then click-and-drag it to any other layer.
Copying a Layer Mask in Photoshop
Layer Masks
Copy a Layer and its Mask to another document (Photoshop)
One quick way
how to copy layers from one document to another document Adobe Photoshop 2022
in this video, I will show you how