[
'file' => 'Atest.doc'
]

[
'file' => [
    'tmp_name' => '/Applications/MAMP/tmp/php/phpgBEFye',
    'error' => (int) 0,
    'name' => 'Atest.doc',
    'type' => 'application/msword',
    'size' => (int) 45056
]

echo $this->Form->create($contact, ['id'=>'contact-form']);
 echo $this->Form->file('file', ['label'=> 'Cover Letter']);
 echo $this->Form->button('Send');
 echo $this->Form->end();

<?php
 namespace AppController;
 use AppControllerAppController;
 use AppFormContactForm;
 use CakeORMTableRegistry;
 use CakeMailerEmail;
 use CakeNetworkExceptionSocketException;

 use BurzumFileStorageStorageStorageManager;

public function index($option = 'index'){
       $contact = new ContactForm();
       if ($this->request->is('post')) {


           if ($contact->execute($this->request->getData())) {
            //debug($this->request->getData() );
            }
        }
  ///..I omitted the rest
}