For documents like PDFs, there’s no way to put canonical tags from the web page header for the reason that there is not any web site portion. In this sort of conditions, you’ll really need to use HTTP headers to established canonicals. HubSpot CMS consumers can adjust their options to https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html