File this under how things work:
1) There is the the admissions committee, who evaluate and decide on acceptance. and the admissions staff, who handle the "paperwork" or processing the application so it gets to he proper people to evaluate and decide.
2) At each individual medical school when you apply, you are added their admissions / intake system. That is your overall file. Within that file you have AMCAS, secondary, letters, etc. So your application is a subset of that file
3) when you communicate with a school, it will first be seen by admissions staff. Most schools automatically add all email to the school file but that does not mean it is added to the application
4) If you send say an update, it can be anything from thrown into the school file to a comment added to application summary to sent to adcom
5) Unless something submitted is a) part of the formal application process and b) present when your file is sent to be evaluated, there is less likelihood it will be seen by adcom in any substantive way.