<p>When I updated my EC’s, I sent them a formal letter through snail mail with my common app number at the top. I presume the school doesn’t have time to answer all of those emails, so anything that you send will be added to your file and be looked over when they make a decision.
Once you send it in, log in to your Brown portal and look at the items the school has received. If you sent a letter or anything else that wasn’t required it should say something like “other portfolio received.” If it’s there, it will be looked over by the admissions officers.</p>