[support] Drupal 7 form file element issue

Hi Experts I have a simple D7 form and have a file element as below. $form['q_name']['q_file1'] = array( '#type' => 'file', '#title' => "Upload document", '#size' => 60, ); Its a 2-step form. User fills data in page1, previews it (page 2) and submits. If I do submit from page 1, it works fine. If I do submit from page 2, looks $_FILES array values are not there. 'name' , 'tmp_name', 'error' indexes are missing from $_FILES array. I am sure others might have faced this issue earlier. Can somebody kindly give me a pointer how to fix this issue or whats the work around here. Thanks Austin