Audio box won't appear when exit visual builder

My audio box seems alright when in editing mode. But when I exit visual builder, it won't appear and only appear as code. How do I solve this? Below is the code that I use:

<div align="center"><audio controls autoplay
src="https://library.utm.my/csr/wp-content/uploads/sites/54/2020/02/WP-page-16-BI-M-edited.mp3">
</audio></div>

Attached together are the screenshots of both editing mode and view mode.