fix

src/forge/Upload/Index.js

@@ -96,6 +96,7 @@ class Index extends Component {
     const upload = {
       name: 'file',
       fileList: list,
+      multiple: true,
       action: actionUrl || `${getUploadActionUrl()}`,
       onChange: this.handleChange,
       onRemove: this.onAttachmentRemove,