Sorry - should have added - here is line 74 from the indicated file:
if (is_uploaded_file($_FILES[$fileField]['tmp_name'][$x])) $fileArray[] = ['tmp_name'=>$_FILES[$fileField]['tmp_name'][$x],'name'=>$_FILES[$fileField]['name'][$x],'type'=>$_FILES[$fileField]['type'][$x],'size'=>$_FILES[$fileField]['size'][$x]];