Treat every upload as untrusted until file type, size, and required security checks complete. Store access policy, request identity, file version, checksum, processing state, and review decision separately. A replacement should not erase the file that supported an earlier decision, and a reviewer should be warned when a newer version arrives.
Define how long original files, extracted fields, review notes, and exported records remain available, who can download them, and how deletion or legal holds affect the workflow. Avoid placing sensitive content in notification messages or logs. Test interrupted uploads, password-protected files, duplicate documents, unavailable extraction services, and access removed during review.