PHP gdrive upload file - php

Question

There is no error. Why is not the file sent?
error_reporting(E_ALL);
ini_set('display_errors',1);
try{
require_once './vendor/autoload.php';
$client = new Google_Client();
$oauth_credentials = './vendor/test.json';
$client = new Google_Client();
$client->setAuthConfig($oauth_credentials);
$client->setScopes('https://www.googleapis.com/auth/drive');
$driveService = new Google_Service_Drive($client);
$fileMetadata = new Google_Service_Drive_DriveFile(array(
'name' => 'photo.png'));
$content = file_get_contents('./vendor/plik.png');
$file = $driveService->files->create($fileMetadata, array(
'data' => $content,
'mimeType' => 'image/png',
'uploadType' => 'multipart',
'fields' => 'id'));
printf("File ID: %s\n", $file->id);
}catch(Exception $e){
echo $e->getMessage();
}

Answer 1

You appear to be using a service account. A service account is not you. Files uploaded using a service account will be uploaded to the service accounts google drive account.
Tips for using service accounts with google drive:
No there is no web view for the service accounts files.
Do a file.list to see if the file was in fact uploaded to your service account.
share a directory on your personal google drive account and have the service account upload to that. Remember to grant yourself permissions to the file.