Most job seekers struggle with deciding where in their application mail their cover letter should be.
Should it be written as the body of the email itself or saved in a file and attached to the mail??
An optimal approach is to have a short summary of the contents in the cover letter as the body of the mail and have the Cover Letter itself attached to the mail alongside your CV.
And remember that, it’s better to have both your CV and Cover Letters in PDF when attaching to the mail.