Hi @juliana_lima
I just tested this in one of my sandboxes, and both image and sound worked just fine. I grabbed the embed code from a YouTube video, dumped it in the HTML editor for a page.
With the New RCE, you can use the embed media icon, which might be easier for those unfamiliar with the HTML Editor. This guide will help, How do I upload and embed media from an external source in the Rich Content Editor as an instructor?
Have you tried simply deleting it and re-embedding it? May have just been a corrupted file.
If none of this works, I can only suggest submitting a support ticket.
Kelley
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