Answer:

In the share management screen, you can select the option "If any file changes, send share change notification email".  By doing this, you and other users who share this file will receive the option of sending a notification to all other users if you make any changes to the file.  If you have Outlook or Outlook Express, it will open with an e-mail template with information about the share.  You can then send it via your own e-mail address.  Drive HQ does not automatically send the share notification due to some e-mail providers filtering our e-mails as spam.  If you don't have Outlook, you can copy the provided share notification e-mail and paste it into a different e-mail program.