smart_warehouse.php

```php
<?php
// Set headers for file download
header('Content-Type: application/pdf');
header('Content-Disposition: attachment; filename="VLC_Smart_Warehouse_Fact_Sheet.pdf"');
header('Content-Length: ' . filesize('assets/VLC_Smart_Warehouse_Fact_Sheet.pdf'));

// Output the file
readfile('assets/VLC_Smart_Warehouse_Fact_Sheet.pdf');
exit;
```