Salvar uma imagem na tabela gallery_images utilizando o CakePHP

AdminController.php

<?php

class AdminController extends AppController {
  
  // .. outras actions aqui
  
  public function admin_upload_image() { 

    $this->layout = 'admin_index'; 

    if($this->request->is('post') || $this->request->is('put')) { 

      $file = array( 
        'GalleryImage' => array( 
          'path' => $this->request->data['gallery_images']['path']['name'] 
          ) 
        ); 

      move_uploaded_file($this->data['gallery_images']['path']['tmp_name'], $_SERVER['DOCUMENT_ROOT'] . '/html/PushUp_app/app/webroot/img/gallery/' . $this->data['gallery_images']['path']['name']); 

      $this->loadModel('GalleryImage'); 
      $this->GalleryImage->create(); 

      if ($this->GalleryImage->save($file)) { 

        echo 'Salvou'; 
        exit; 

      } else { 

        echo 'Não salvou'; 
        exit; 

      } 

    } 

  }
  
}

GalleryImage.php

<?php
App::uses('AppModel', 'Model');
/**
 * GalleryImage Model
 */
class GalleryImage extends AppModel {

  public $displayField = 'path';
  public $useTable = 'gallery_images';
  
}