When I save a Photoshop (PSD) file as JPEG using Save As, the saved file has a jpeg extension, but no software will open it. Im running on a MAC (El Capitan 1011.6) with latest version of Photoshop 2018 CC. This just started happening after recent update. I tried uploading an image and to this forum and this is the error message: "Sorry! We were unable to upload your image because it is not a PNG, JPG, or GIF file. Please ensure your image is one of these formats and try again."