Authory analyzes every article that goes into your account: what's the headline, what's the byline, the date, the article text, number of words, the article images etc. That way we can ensure that articles look beautiful on your Authory page, that we can notify your email subscribers, find the right social media data and much more.
Extracting text content properly from PDFs is next to impossible because PDFs as a proprietary format are simply not made for that.
Hence, we currently can't support PDFs as part of the automated import of new articles. Having said that, you can add PDFs if there are available at a certain URL by pasting that URL when adding an article manually.