Choose Select > All to select all of the pixels in the layer, and choose Edit > Copy. Then make the destination image active, and choose Edit > Paste.
Drag the layer’s name from the Layers panel of the source image into the destination image.
Use the Move tool (Select section of the toolbox), to drag the layer from the source image to the destination image.
The copied layer appears in the destination image, above the active layer in the Layers panel. If the layer you’re dragging is larger than the destination image, only part of the layer is visible. You can use the Move tool to drag other sections of the layer into view.
