Yes, they are receptive. Here's the response I received when I asked about it.
"Dear applicant,
Thank You for your interest in Howard University’s College of Medicine. We request that you send all application updates, via email, to
[email protected] with the subject line APPLICATION UPDATE. This will expedite the process of reviewing the update and helps the admissions staff review emails more efficiently. Please include all update materials in the body of the email if possible. Please Note: Application Updates cannot be officially added to your application as all official application updates must be verified through AMCAS. Therefore, attachments will not be able to be uploaded to your AMCAS account through the Admissions office. Once again, the Admissions staff appreciates your interest in Howard’s medical school.
Sincerely,
Howard University’s College of Medicine-Office of Admissions "