I do exactly what you are asking about. I keep my covers in my cloud account and download to pdf when I'm ready to send. I choose no cover sheet and add any other attachments when I send, drag and drop. A little different on the mobile app, again download to pdf, this time to documents on the mobile app, then send as a fax with it and any other attachments making sure to choose the no cover sheet option. I do this every morning 3 or 4 times no issues at all. Good luck.