Learn how to format an email or hard copy letter with an attached document and review our examples to use as a guide. Tell your Health Care Agent, family members, and doctor that you have filled out a new Five Wishes.Make sure they know about your new wishes. Use a formal tone and style. Be professional and polite. Mention the attached file in the email body. Attach an appropriate file format. Cover Letter Writing Guide. Cover letter samples for your industry and tips for impactful cover letter writing. Documents are then referred to as "Attachments" or "Exhibits".