feature: Support custom button for the upload

Support custom button in the upload form item

Change-Id: Ib246c437e91814352d75fa2fc2bde9e7c1be8888

releasenotes/notes/Support-Custom-Button-For-Upload-c44a4ff8e55c5961.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Support custom button in the upload form item

src/components/FormItem/Upload/index.jsx

@@ -92,9 +92,11 @@ export default class index extends Component {
     };
     return (
       <Upload {...props}>
-        <Button>
-          <UploadOutlined /> {t('Click to Upload')}
-        </Button>
+        {this.props.children || (
+          <Button>
+            <UploadOutlined /> {t('Click to Upload')}
+          </Button>
+        )}
       </Upload>
     );
   }