Appeal deadline questions after an unemployment denial after 6 years as a dental hygienist

I got a denial letter last week saying I left my job voluntarily, but I was let go as a dental hygienist. I do not usually post, so bear with me. I have not done a hearing before and I am nervous. Did you bring documents or only talk?

File the appeal before the deadline, even if you are unsure. You can gather documents afterwards. That is the one part I would not wait on.