[TYPO3-mvc] Front end upload image

[Eat Dimanche]

Hi,

*** I have a problem to upload image in the front end.
*** I have a form :

<f:form action="updatePicture" controller="Member" object="{picture}" 
name="picture" arguments="{member: member}" method="post">
	<f:form.upload property="file" name="img" />
	<br />
	<f:form.submit value="Submit"></f:form.submit>
</f:form>

*** I don't know how fluid works to store the file has uploaded.

*** I have tried this in my controller:

public function updatePictureAction(Tx_YejjMembers_Domain_Model_Member 
     $member, Tx_YejjMembers_Domain_Model_Picture $picture)
	{

		$this->pictureRepository->update($picture);					
		move_uploaded_file($_FILES['img']["tmp_name"], 		 
        		"uploads/pics/" . $picture->getFile();
		
		$this->redirect('picture', 'Member', NULL,
				array('member' => $member));
	}

*** But there is no any uploaded file in my folder.
*** Does anyone have the ideas?
Thanks in advance,

Best regards,
Dimanche