Connector does not detect PDF for PNAS site

When I use the Save to Zotero browser extension on any of various PNAS articles (e.g. https://www.pnas.org/content/79/8/2554), Zotero does not detect the full-text PDF even though the PDF is accessible.

Is there something I might have missed? Should Zotero detect the PDF?

Thanks!
Sign In or Register to comment.