Fatal error: Uncaught Error: Class "Aws\Signature\S3SignatureV4" not found in C:\www\api\vendor\aws\aws-sdk-php\src\Signature\S3ExpressSignature.php:9 Stack trace: #0 {main} thrown in C:\www\api\vendor\aws\aws-sdk-php\src\Signature\S3ExpressSignature.php on line 9