上传教材文件选择类型问题

projects/textbook/src/app/comp-upload/example-upload/example-upload.component.html

@@ -18,4 +18,4 @@
     title="上传PDF"
   ></app-comp-upload>
 
-  <!-- <button (click)="get('http://hep-textbook.oss-cn-beijing.aliyuncs.com/undefined/2024-10-8/1728352740465-test.pdf')"></button> -->
+  <button (click)="get('http://hep-textbook.oss-cn-beijing.aliyuncs.com/undefined/2024-10-8/1728352740465-test.pdf')"></button>