I just received a new LOR from my employer and submitted it to AMCAS. I know that my file will be automatically updated with the new letter at the schools I assign it to, but would this also be a good time to send in an update letter/LOI to schools I'm still waiting to hear back from (pre-interview)? Haven't sent in any update letters etc. to any schools yet, so I'm not really sure how this all works. Any help is appreciated!