Update creocoder\flysystem\GoogleCloudFilesystem to support the GoogleStorageAdapter which allows VISIBILITY_NOT_SET

GoogleCloudFilesystem.php

<?php
/**
 * @link https://github.com/creocoder/yii2-flysystem
 * @copyright Copyright (c) 2015 Alexander Kochetov
 * @license http://opensource.org/licenses/BSD-3-Clause
 *
 * Updated by Michael Kubler @kublermdk to support VISIBILITY_NOT_SET by using the different Google Storage Adapter
 */

namespace app\adaptors;

use Google\Cloud\Storage\StorageClient;
use \app\adaptors\GoogleStorageAdapter as GoogleStorageAdapter; // Point this to where-ever you place these

/**
 * GoogleCloudFilesystem
 * @package app\adaptors\GoogleCloudFilesystem
 *
 * To enable the use of the \Superbalist\Flysystem\GoogleStorage\GoogleStorageAdapter
 */
class GoogleCloudFilesystem extends \creocoder\flysystem\GoogleCloudFilesystem
{

    /**
     * @return GoogleStorageAdapter
     */
    protected function prepareAdapter()
    {
        $config = [
                'projectId' => $this->projectId,
                'keyFilePath' => \Yii::getAlias($this->keyFilePath),
        ];

        $client = new StorageClient($config);
        $bucket = $client->bucket($this->bucket);
        return  new GoogleStorageAdapter($client, $bucket);
    }
}