Restore vanilla components

app/javascript/mastodon/features/compose/containers/upload_progress_container.js

@@ -0,0 +1,9 @@
+import { connect } from 'react-redux';
+import UploadProgress from '../components/upload_progress';
+
+const mapStateToProps = state => ({
+  active: state.getIn(['compose', 'is_uploading']),
+  progress: state.getIn(['compose', 'progress']),
+});
+
+export default connect(mapStateToProps)(UploadProgress);