RAW processing is available for any unadjusted RAW image. However, if the image was adjusted by Photos or Photos extension, then you will be editing the JPEG that was provided by that other editor. If it was edited with RAW Power, then you also will have access to RAW Processing. One way to tell the situation is to see if the app offers “Revert to Original” when you first open it. If so, then the image was previously edited (by some app, including RAW Power).