Efficient Digital Archive System

I need a streamlined digital-archiving solution focused exclusively on our financial documents (dokumen keuangan). The key outcome is a 25 % reduction in the time it currently takes my team to locate any invoice, receipt, or report.

Here is what the finished system should let us do:
• Scan or import existing PDFs, spreadsheets, and image files, auto-extracting metadata such as date, supplier, and amount.
• Tag and index every record so a keyword or date range search instantly returns the right file.
• Control access: accountants view everything, auditors get read-only links, and everyone else sees nothing.
• Generate audit trails showing who opened or modified any document.

I’m open to whichever stack you prefer—as long as retrieval is lightning-fast and the interface remains simple enough that non-technical staff need almost no training. Please outline your approach, the tools you’d use (OCR engine, database, search library, cloud or on-prem hosting), and a realistic timeline for handing over a fully tested system plus deployment notes.