"With great power comes great responsibility." So said wise old Uncle Ben to a young Peter Parker. With Claude Cowork, you're granting the AI enormous power, but the responsibility of what it does ...
Any null values will show as blank cells in the final Excel table. If you'd prefer to fix this within the Power Query Editor, ...
Your downloads folder is probably a mess, but all it takes is the right app to get things properly organized and cleaned.
Cowork can also use the data in that folder to create new projects -- but it's still in early access, so be cautious.