snippet.php

<?php
    if (!empty($_FILES['file'])) {
      $file = $_FILES['file'];
      $result = $rest->post($oa->resourceUri("image"), array(
        'title' => $formData['upload_title'],
        'license' => array($formData['license'] => TRUE),
      ));

      try {
        // Move the uploaded file so that we get a proper name
        mkdir($dir = $file['tmp_name'] . '_dir');
        $destination = $dir . '/' . $file['name'];
        move_uploaded_file($file['tmp_name'], $destination);

        // Post the file
        $rest->postFile($oa->resourceUri("image/{$result->nid}/file"), 
          $destination, $file['type']);

        // Set url and title
        $formData['title'] = $formData['upload_title'];
        $formData['uri'] = $result->url;
      }
      catch (Exception $e) {
        $rest->delete($oa->resourceUri("image/{$result->nid}"));
        throw $e;
      }
    }
    unset($formData['upload_title'], $formData['submit']);
    $rest->post($oa->resourceUri("{$resource}/{$nid}/link"), $formData);