$_FILES Array getting empty when using $this->form_validation->run()

After your first $data, get the last_id

Code:

   $this->load->model('My_Backend_model');
    $result = $this->My_Backend_model->lets_insert_form_post($data);
    $lastid = $this->db->insert_id();

then within your second $data which is named as  $data2 

Code:

$data2=array(
         'bla bla column from your db' => $array,
         'propertyid' => $lastid
         );

then send this $data2 to Model as well.