Any change you make to an image only affects the active layer. If you don’t see the desired results when you manipulate an image, make sure that the correct layer is selected.
In the Layers palette, select a layer’s thumbnail or name.
To select more than one layer, hold down Ctrl and click each layer.
Select the Move tool , right-click
the image, and choose a layer from the context menu. The context
menu lists all the layers that contain pixels under the current
pointer location, as well as all adjustment layers.