For our invoices, I would like to customize the PDF print reports. I want to add another logo to the header and a watermark to the full page (important: it should overlap with the footer). Both should be on all pages in the PDF.

I can work with the default templates in Odoo (din5008, layout background,...) and Studio.

Please note: I don't have access to the Odoo Installation path and folders.

I googled a lot in regards to reports and watermarks in Odoo but I can't find a functioning solution for me to get the watermark in the page, overlapping the footer and be visible on a PDF.  Maybe someone got a proper code for a default template with a fullsize background?