How to update some colleges on an extra curricular which have issues with email?

I recently won an international competition I really want to update colleges on since I feel it will help my application. My counselor asked me to write a few paragraphs on the activity and he’s saying he’ll email that write-up to colleges. The reason I’m asking is that some colleges like Stanford have stated that they do not accept any unsolicited email attachments or application materials via email. Since my counselor is emailing them, would it make a difference or do I have to update them through other channels?

Any help would be appreciated. Thanks.