Don't upload everything yet. Just describe your situation in plain words and attach the most important letter — your denial, your most recent rating decision, or the letter that started this fight. VAi will read it, tell you where you stand, and let you know if it's worth building a full case.
Your denial letter, rating decision, or most recent VA letter
PDF or photo — either works
Photograph your VA letter pages, then combine them into one PDF file. Here's how on each device: