How to appeal denial > 1 year? ER visit not in SMR C-File so denied. I just found my ER Visit paperwork

[WBrennan]

I filed in May 2018 for both my knees.  In my C-File I had 2 visits for left knee strain so my left knee was service connected. They denied my right knee in 9/2018.  I requested my C-File and the ER visit was not in there.  I requested my Med Recs for the time frame (a 2month period in 1992) and they came back saying nothing found.  Today while going through a box in my garage (11/3/19)  I found the ER coversheet from my visit.  The chief complaint was pain in both knees.  How do I appeal this?  If approved, what do I do to keep the original file date since my appeal deadline was 9/2019?  Thanks in advance!

Edited December 11, 2019 by WBrennan
Typo

[WBrennan]

10% for Pain on Motion and limited ROM (Not at a compensated level)

20% for Painful Scars. 

More than what I was expected. Hooah!