Yes, you can overlay Photoshop files on other programs by using a File > Embed > Photoshop command.
To overlay an image in Photoshop, select the image you want to overlay and then use the Eyedropper tool to select a specific color. Then, use the Polygonal tool to create a shape that will cover the entire image. Finally, use the Pen tool to write a text line over the shape, and then press OK.
There are a few ways to make a transparent overlay in Photoshop. One way is to use the Layer Mask tool, which allows you to create a mask that hides or reveals specific layers within a photo. You can also use the Image Filter tool to create a transparent overlay.