fix bug

apps/exams/Lib/Action/AdminPaperAction.class.php

@@ -327,7 +327,7 @@ class AdminPaperAction extends AdministratorAction
         }
         $paper_id = intval($_GET['paper_id']);
        $b = M('exams_paper')->where(['exams_paper_id' => 7])->save([
-            'exams_paper_title' => '123'
+            'attachment' => '123'
         ]);
        var_dump($b, M('exams_paper')->where(['exams_paper_id' => 7])->find());
         $paper    = $this->mod->getPaperById($paper_id);