For a second opinion or a higher-lever review, you need to download the VA form 20-0996: Higher-level review and fill it.
This is more about evidence. We didn't have the evidence we needed before, so my case was decided this way because we couldn't provide it. We've finally found it. Can I include it in the case ?
Of course. When you're adding new evidence that supports your case, a reviewer will look at all the evidence and determine whether it changes the decision.
May I ask a follow-up question about relevant evidence? Is it possible for me to submit a supplemental claim as well?