What does the option to attach a file when creating an invoice allow you to do?

The option to attach a file when creating an invoice is designed to enhance the invoice's effectiveness by including essential documentation related to the invoice itself. Including the invoice terms and conditions directly supports the clarity and transparency of the transaction, ensuring both parties are aware of the agreements in place. This legal and procedural information can help prevent disputes and provide a comprehensive understanding of payment expectations or service agreements.

The other options may be useful in different contexts but are less relevant for an invoice specifically. For instance, customer feedback forms, while valuable, are typically not part of the invoicing process. Promotional materials might be better suited for marketing communications rather than transactional documents. Similarly, attaching innovation suggestions and ideas is not appropriate for an invoice, as this would not pertain to the transaction at hand. Therefore, including terms and conditions as an attached file directly aligns with the function of an invoice.