我找到 public function insert_tad_news()
是呼叫
$this->TadUpFiles->upload_file('upfile', $this->tadnewsConfig['pic_width'], $this->tadnewsConfig['thumb_width']);
而在 public function update_tad_news($nsn = "")
是呼叫
$this->TadUpFiles->upload_file('upfile', $this->tadnewsConfig['pic_width'], $this->tadnewsConfig['thumb_width'], null, null, true);
兩者不同