$url = 'https://api.example.com/upload';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_SAFE_UPLOAD, false);
//file url
$file ='http://www.example1.com/ex.zip';
// I need here something to work with file url
curl_setopt($ch, CURLOPT_POSTFIELDS, $file);
//--------------
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'X-AS24-Version: 1.1',
    'Accept-Language: en-GB',
    'Content-type: multipart/form-data',
    'Authorization: Bearer ' . $access_token
));
$output = curl_exec($ch);
curl_close($ch);
return $output;