Cargue el archivo en Google Drive usando el token de acceso. ¿Qué alcance de autenticación se requiere?

I am trying to upload a file to Google Drive with PHP.

For the authorization code, I am using the following scopes:

https://www.googleapis.com/auth/drive  
https://docs.google.com/feeds/  
https://docs.googleusercontent.com/  
https://spreadsheets.google.com/feeds/  

I already received a valid refresh_token, and I'm able to use it to fetch a new access_token anytime I wish.

Now the problem is when I am trying to perform the upload using this access_token (it is not exprired, and not used yet) dice:

stdClass Object
(
    [error] => stdClass Object
        (
            [errors] => Array
                (
                    [0] => stdClass Object
                        (
                            [domain] => global
                            [reason] => required
                            [message] => Login Required
                            [locationType] => header
                            [location] => Authorization
                        )

                )

            [code] => 401
            [message] => Login Required
        )
)

I am using curl with following header:

Array
(
    [0] => Content-Type: text/plain
    [1] => Content-Length: 503242
    [2] => Authorization: Bearer ya29.AHES6ZRWXZkZDDi6AFV9PK2QonHp93nIfJbYqipXFT1uCsg
    [3] => GData-Version: 3.0
)

And following URL:

https://www.googleapis.com/upload/drive/v2/files?uploadType=media

The CURL Command is like:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADERS, $headers);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, file_get_contents($file));
$return = curl_exec($ch);
curl_close($ch);

Any Help will be heartly appreciated... Thanks in advance...