A sheet remembers who submitted what — but doesn't hold the documents.
Excel/Sheets is handy for a candidate list, but the documents live elsewhere and the status is updated by hand. Doki combines document collection and completeness status in one place.
A spreadsheet for overview. Doki to both collect documents and see status without manual work.
The list, yes — but documents and status need manual updates. Doki updates automatically on upload.
Yes — packages and statuses export with no lock-in.