Put the current supplier invoice PDF on its matching bill, or flag a match that needs a person.
Attach supplier invoice PDFs to matching open bills.
Your bills carry supplier invoice PDFs for review, and your payables person sees any match that needs a decision.
Attach incoming invoice PDFs to bills before payment review.
Your reviewers find the invoice PDF on the pending bill. Your payables person sees any match that needs a decision.
Attach corrected invoices to pending bills and preserve prior copies.
Your pending bill carries the corrected invoice with its earlier version linked when the match is clear.