Feature
Amazon invoices is a feature, which needs to be enabled. Click Tools>Features , and filter for amazon .
For details on automatically generating and uploading invoice to Amazon please see here: Amazon Invoices .
Invoice Options

Invoice options are available in Packing Partner from: Tools>Options>Invoice
Header logo
Image to display at the top left of the invoice, image format must be .png or .jpg, click Browse to select the image.
Sender details
Company contact details to be displayed on the top right of the invoice
Invoice title
The title to go across the middle of the invoice above the product table
Footer text
Text to be displayed at the bottom centre of the invoice
Vat Number
Company VAT number. If you aren't VAT registered, leave this box blank, then the invoice won't show any VAT information.
Preview
Click to update the invoice preview