Got a denial letter for unemployment, what now? (Cincinnati)

My claim was denied after 20 weeks of waiting, and the letter says I have a short window to appeal. The letter lists a deadline and a hearing process, but it is hard to follow. Did you bring documents or only talk?

Thanks for writing this out. I went through something close to it 14 months ago, and it got easier once I kept a simple log of every call and form.