A complete checklist of the whole system, screen by screen: what each part does, what it affects, how to test it and what should happen. Mark a status on every item, write notes, and send me the summary when done.
For each item: click the name for details, open the live screen via the link, test by the steps, mark Works / Partial / Broken and add a note if needed. Marks save automatically on this computer. When done, press "Summary & send" and paste the result to me in chat, or leave a comment on the page. For paper or PDF — use the Print button above.