I managed to add the footer to all pages by creating a new div element that doesn’t show up on the website but shows only on the pdf iframe and the printed/downloaded file.
This is the code in the HTML:
<div class=”footer_pf”>Footer content here</div>
This is the code in the Custom CSS of the plugin:
pf-body .footer_pf {
display: block;
position: fixed !important;
bottom: 0px;
}
This is the code in the CSS section of my wordpress theme:
.footer_pf {
display: none !important;
}