Here are three ways to copy a layer in Photoshop:
1. Click on a layer you’d like to copy. If you want to copy multiple layers, hold Command (Mac) or Control (PC) and click between your desired layers. Now go to Edit > Copy to copy your layer(s). To paste your layers in a new location, go to Edit > Paste.
2. Right-click the layer that you want to copy in the “Layers” panel on the right sidebar. Select “Duplicate Layer.” In the Duplicate Layer window, click the drop-down menu next to “Document.” Select the name of the destination Photoshop document and click “OK” on the right.
3. Click next to the layer’s name and hold. Drag the layer up and hover over the name of the destination image. Move down into the image and let go.