Should I Submit Additional Documentation? Forum

[Spack]

I was waitlisted at one of my top choices and I was wondering if now would be the appropriate time to submit some additional documentation, not only to the school I was waitlisted at, but also to other schools who have yet to provide me with a decision. I'm thinking of possibly submitting some things that I probably should have in my original application but was concerned about including too much specifically a lsat addendum and/or a diversity statement.

Supposing this is okay to do, would I just send the files to the schools via email or is sending it via snail mail the more appropriate way to do this?