Google Drive is Google's file sync app that lets you store all of your files online alongside your Google Docs documents, and keep them synced with all of your devices.
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.