Fatal error: Uncaught Error: Class "Aws\Multipart\AbstractUploadManager" not found in D:\Proyectos\Conciliaciones\Composer\vendor\aws\aws-sdk-php\src\S3\MultipartCopy.php:10 Stack trace: #0 {main} thrown in D:\Proyectos\Conciliaciones\Composer\vendor\aws\aws-sdk-php\src\S3\MultipartCopy.php on line 10