A PDF or spreadsheet does not announce that it is the right version for a ledger period. Currentness depends on the business event, effective date, source owner, and the rule for replacing an earlier record. A vendor form may be amended after a payment request. A payroll register may be rerun. A bank statement may be corrected or reissued. A client schedule may carry a new tab while the filename stays the same.
The research question is therefore about version relationships. Can a reviewer identify the active source, see what it superseded, understand who supplied it, and connect the selected version to the bookkeeping action? That is particularly important when an offshore preparer receives documents asynchronously and cannot rely on an informal desk conversation.