Added search for existing chats

lib/view/pages/files/files.dart

@@ -151,6 +151,7 @@ class _FilesState extends State<Files> {
         ],
       ),
       floatingActionButton: FloatingActionButton(
+        heroTag: "uploadFile",
         backgroundColor: Theme.of(context).primaryColor,
         onPressed: () {
           showDialog(context: context, builder: (context) {