Under the mail option of the share sheet there's "Open in Another App" and when I select iBooks, Documents, etc. apps, it saves them as a PDF in the respective app's document storage (if PDF is appropriate for that app).
Under the mail option of the share sheet there's "Open in Another App" and when I select iBooks, Documents, etc. apps, it saves them as a PDF in the respective app's document storage (if PDF is appropriate for that app).