Summary:

Can I send a .ZIP file that contains the PDF invoice and it's attachment(s)?

Instructions:

Via the PDF eInvoice Service, it is not possible to send .ZIP files that contains the PDF invoice and it's corresponding attachment(s).
The PDF eInvoice service is only capable of accepting and processing invoices saved as machine readable PDF files. You can find more information and instructions on how to generate a machine readable PDF in this article.

Any attachment(s) you would like us to process together with your invoice, will have to be added following the attachment handling policy.