diff --git a/src/views/plugin/workflow/mixins/custom-fields.js b/src/views/plugin/workflow/mixins/custom-fields.js
index c530c4e..685eeb3 100644
--- a/src/views/plugin/workflow/mixins/custom-fields.js
+++ b/src/views/plugin/workflow/mixins/custom-fields.js
@@ -26,7 +26,7 @@ export default {
           action: '/api/blade-resource/oss/endpoint/put-file',
           display: true,
           span: 24,
-          canvasOption: {},
+          canvasOption: { text: ' ' },
           icon: 'icon-upload',
           showFileList: true,
           multiple: true,