Using TOAST UI editor, I cannot upload image that has a over 50kb

Question

I have a problem that I had could not upload to my web-site to image file.

I have several image file. The thing I had succeded upload to image is 30kb~ 50kb.

But, the thing I had failed upload to image is over 50kb~.

I have used TOAST UI Editor, next js, express

Also, I detached to picture shown this problem.

left side, the rendering component. (5657~~ << It is just title. I want to image at 'content div'

right side, chrome developer mode in console.

I had non-error response. But, just there are no rendering.

below, rendering component.

const Post = () => {
  const router = useRouter();
  console.log('저기', toJS(dynamicPost.post?.content))

  useEffect(() => {
    dynamicPost.postR(router.query.id);
  }, [router.query.id]);

  return useObserver(() => (
    <AppLayout>
      <div> {toJS(dynamicPost.post?.createdAt)} </div>
      <div> {toJS(dynamicPost.post?.title)} </div>
      <div> {ReactHtmlParser(toJS(dynamicPost.post?.content))} </div>

    </AppLayout>
  ));
};