[Cake 2.6.3] Cake's FileUpload Validation not working; what is wrong?

I have a model "Attachment" which Belongs to another model (hasMany Attachment). 

In model Attachment I put a validator (from the Cake helpbook) to check against filetypes. After saveAssociated i would expect an error if uploaded a .txt file, but the model is save successfully?

Add.ctp 

for($i=0;$i<1;$i++)

{

    ?>

    <div class="row">

        <?php

        echo $this->Form->file('Attachment.'.$i.'.submittedfile');

        ?>

    </div>

<?php

}

Attachment model:

<?php

App::uses('AppModel', 'Model');

class Attachment extends AppModel {

    public $belongsTo = 'CollectionRequest';

    public $validate = array(

        'image' => array(

            'rule' => array(

                'extension',

                array('gif', 'jpeg', 'png', 'jpg')

            ),

            'message' => 'Please supply a valid image.'

        )

    );

    public function beforeSave($options = array()) {

        parent::beforeSave($options);

    }

    public function beforeValidate($options = array()) {

        // ignore empty file - causes issues with form validation when file is empty and optional

        if (!empty($this->data[$this->alias]['error']) &&

            $this->data[$this->alias]['error']==4 &&

            $this->data[$this->alias]['size']==0) {

            unset($this->data[$this->alias]);

        }

        parent::beforeValidate($options);

    }

}

?>

Controller

 if ($this->CollectionRequest->saveAssociated($this->request->data)) {

                // All good

            

                $this->Session->setFlash(__('CollectionRequest saved'));

                return $this->redirect(array('action' => 'index'));

            }

thanks

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