Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
Track each source PDF revision as its Markdown is saved.
Get Markdown from PDFs in your knowledge-base folder, with questionable pages called out for your editor to review.
Locate requested project files and flag uncertain matches.
Your coworkers get a file link on their request, even with only a topic or project. Unclear matches come back with a question.
Keep late project files with the pending document review.
Your reviewer sees missing files on the pending approval item, even when a requester adds them after the review starts.