Can you send more info to schools after apps are submitted?

I guess it is possible because some people have discussed doing this, but I dont understand how?
Would you have to email a school? I guess its important they know about any new achievements from senior year, but I feel like submitting more info after the deadline may come off as a bit annoying?

I’m just wondering because results for this contest I entered are revealed after common apps deadline. And I feel pretty good about how I did in the contest, so under the circumstance that I am recognized, I’m unsure of whether or not I should bug the admissions ppl about this?
Anyone who submitted extra info after the deadline, how did you do it?

Thanks!

EMail the school. Make sure it’s a worthwhile update.

Agree, you can send an email update if it is something significant. Keep the email short and sweet (state the achievement succinctly in a couple of sentences and I’d reaffirm your interest in the school in the last sentence).