You can file a Supplemental Claim within 1 year of a decision if you have new evidence, unless one of these rare situations applies to you.
Another concern about the fiduciary claims. What happens if I want to know more information later?
For more information you can go for the FAQs section about decision reviews.
By the way, do you know about the claims and appeals that I can make about my case? What is the reasonable time to file a claim?