Please see the screenshots below to see where in your account you can upload a product invoice. It's important to have an invoice on file for each warranty you have purchased.
Step 1: Click on your Warranty # to access its options.
Step 2: Click on the "Upload a File" button.
Step 3: Select your invoice file from your computer and click "Upload". That's it! You should see your uploaded files to the right of the page.