Appeal deadline questions after an unemployment denial after 18 years as a social media manager

My claim was denied after 21 weeks of waiting, and the letter says I have a short window to appeal. My employer's version of events does not match mine, and I have emails that show it. Did you bring documents or only talk?

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