Try it through the blupry website, I purchased the code for this widget from them and beyond the code itself, which works great, they provide a service and will help you edit the code so that it fits your application, which is worth much more
https://community.flutterflow.io/widgets-and-design/post/how-to-add-a-markdown-or-rich-text-editor-in-flutterflow-yZnDKhB7yPKuAjV?highlight=4zG7XEVwIWXHTc0