One of the most popular email services, Gmail keeps track of all your emails with threaded conversations, tags, and Google-powered search to find any message you need.
Reply to spreadsheet export requests with the requested CSV file.
Your coworkers get the Google Sheets tab they asked for as a CSV attachment, or a reply explaining what needs fixing.
Email requested tab exports and flag missing or empty tabs.
Get the requested spreadsheet tab into your colleague's inbox as a CSV file. Your request row shows what happened.