How to add "Upload succeed" message?

FAQ
1

To add an “Upload Succeed” message, subscribe to the onUploadComplete event. E.g.:

const widget = uploadcare.Widget("[role=uploadcare-uploader]");
widget.onUploadComplete((info) => { 
  // Handle uploaded file info.
  console.log('Upload Succeeded!');
});

For more information, see JS API docs.