How can I share pdf files in updates on my LinkedIn company page?

You may share a PDF file the same way you share any file on Google Drive: select the file, then choose either the "get link" or "share" menu options. You can also share a file stored on Google Drive as either a link or an attachment within Gmail.

Attach a PDF to Calendar events or a Google Sites page to share a PDF in context (Figure D). A PDF attached to a Google Calendar event provides people meeting support materials. (Note: be sure to set PDF file permissions so that event attendees can open the file.) A PDF attached to a Google Sites page lets you share a file in context. For example, a page with a conference workshop description provides context for an attached PDF file of slides.

Source : https://www.quora.com/How-can-I-share-pdf-files-in-updates-on-my-LinkedIn-company-page