Sometimes you will get a dialogue box in photoshop when you are trying to open a new file. And it says "Could not complete your request because an unknown or invalid JPEG marker type is found."

I have found that this is usually an issue with Windows, and very rarely happens on Mac. The below solution has worked for all customers who have had this problem.

  • Open the  image in a photo app such as Preview (on macOS) or Photos (on Windows).
  • Now save the file again as a JPEG image from within such an app. Try opening the file again in Photoshop.
  • This should resolve the issue. 
  • This is a link to a great Youtube tutorial that can help you along the way!