I still remember when I was looking for a job just after graduating from college, I once went to a big company for an interview, and many people followed. I was deeply impressed by the resume of one of them. His resume is unique among many interviewers. He made a very clean and sunny aspect, which is in line with the characteristics of this company.
As a result, after the interview, this person was admitted directly. Up to now, I still vaguely remember the man's appearance, which is so impressive.
Therefore, if you add a cover to your resume, it will make the whole resume by going up one flight of stairs and impressive.