Zotero won't save pdf along with citation

I'm trying to save a Zotero ref. by clicking on the Zotero button in Firefox. I have full access to the PDF, which is displayed in the window in which I'm clicking the Zotero button. Why won't it save the pdf? I have ad-blockers off.
Screenshot here:
https://www.dropbox.com/s/64g8qkcat4gthek/2020-05-21 zotero won't save full text.png?dl=0

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