Got a denial letter for unemployment, what now?, nurse's aide here

My claim was denied after 22 weeks of waiting, and the letter says I have a short window to appeal. It has been a long 22 weeks. My employer's version of events does not match mine, and I have emails that show it. If you have appealed before, what helped you prepare?

Keep everything in writing and save the confirmation numbers. It saved me later.

I printed my emails in order and wrote a one-page timeline. The hearing officer kept going back to it.