When you are working with digital overlays, word art and other images that are primarily transparent, it can be difficult to “grab” those layers to move them.
Positioning your cursor over an opaque area will allow you to move the layer.
When the opaque areas are particularly fine and difficult to drag, simply get the Move tool and uncheck the Auto Select box in the Options Bar.
Doing this will allow you to select the layer in the Layers Palette and drag it to another document.
Be sure to tick the Auto Select box again after you have moved the layer. Most of the time, this is a handy feature that allows you to select items quickly as you work.