Am trying to upload files to an item via php by it throws error internal server 500

Please can someone provide me with the right code

Here is my code

$curl = curl_init();

curl_setopt_array($curl, array(

  CURLOPT_URL => 'https://api.monday.com/v2/file',

  CURLOPT_RETURNTRANSFER => true,

  CURLOPT_ENCODING => '',

  CURLOPT_MAXREDIRS => 10,

  CURLOPT_TIMEOUT => 0,

  CURLOPT_FOLLOWLOCATION => true,

  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,

  CURLOPT_CUSTOMREQUEST => 'POST',

  CURLOPT_POSTFIELDS => array('query' => 'mutation ($file: File!, $item_id: Int!, $column_id: String!) { add_file_to_column ( item_id:$item_id, column_id: $column_id, file: $file) { id}}','variables' => '{"item_id":2267231528, "column_id": "files"}','map' => '{"image":"variables.file"}','image'=> new CURLFILE('https://cdn.pixabay.com/photo/2015/05/26/12/30/baby-784608_960_720.jpg')),

  CURLOPT_HTTPHEADER => array(

    "Authorization: $token"

  ),

));

$response = curl_exec($curl);

curl_close($curl);

echo $response;