Photoshop: How to add pictures to a layer?

There are a few ways to do this. The easiest way is to open the file you want to new layer, make a selection, Edit > Copy. Then go to the document where you want to add the layer and choose Edit > Paste.

https://helpx.adobe.com/photoshop/how-to/compositing.html
https://photoshopcafe.com/photo-composite-photoshop-full-walk-free-photoshop-tutorial/

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