Can faculty post a PDF of a publication that’s behind a paywall?

In most cases, no. OpenScholar sites are public-facing, so we should not upload or host publisher PDFs that are behind a paywall unless the publisher explicitly permits it. If the article is open access, then sharing the PDF is typically fine. Otherwise, the safest approach is to post the citation and link to the publisher’s page, or share an allowable version (e.g., an accepted manuscript) only if the publisher’s policy permits that.