1. Go to this page and download the library: Download idapgroup/s3-storage-sdk library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
// Create an instance of class that implements UploadedFileInterface
$file = new UploadedFile();
$readStorage->save($file, 'filename');
// Create an instance of class that implements S3FileInterface or extends S3File
$imageFile = new S3File('file_path', $writeStorage->getBucket());
$readStorage->transfer($imageFile);