Certificate PDF files and thumbnails should be placed here:

1. ISO-9001-2015.pdf - ISO 9001:2015 Certificate PDF
2. ISO-9001-2015-thumb.jpg - Thumbnail image for ISO certificate

3. SASO.pdf - SASO Certificate PDF  
4. SASO-thumb.jpg - Thumbnail image for SASO certificate

5. SIRI.pdf - SIRI Certificate PDF
6. SIRI-thumb.jpg - Thumbnail image for SIRI certificate

For now, we're using placeholder thumbnails. Replace with actual certificate scans and thumbnails.