Fatal error: Uncaught Error: Class "Aws\S3\MultipartUploader" not found in C:\www\api\vendor\aws\aws-sdk-php\src\S3\Crypto\S3EncryptionMultipartUploader.php:20 Stack trace: #0 {main} thrown in C:\www\api\vendor\aws\aws-sdk-php\src\S3\Crypto\S3EncryptionMultipartUploader.php on line 20