Getting a weird upload issue with Application Transporter

The file xyz.jpeg in the package xzs.itmsp does not exist so the file size could not be validated. I need to add more non-consumable items to our app. First time adding new content to our App. Apple told me to use Apple Transporter rather than version Application Loader 3.


So what I did was use an existing itmsp file, and change the XML files. That should work right, or do I need to change something in the XML file?