iterative-file-editing
Use this skill whenever you create or edit ANY file for the user in the Copilot Studio container — a document, spreadsheet, slide deck, code file, data export, anything. It keeps your work-in-progress durable and shows the user an updated version after every change, so the two of you refine the same file together across turns — the user sees real progress each round, earlier work is never lost, and neither of you has to start over. Apply it from the very first file you make.