Sanitizing custom field content

Hi!

I’m trying to sanitize content from custom field (using Advanced Custom Fields).
I’ve found this solution, but it’s not working for me.

I’ve got:

• GIF image
• YouTube iFrame

Both of them after sanitizing content disappears.
Here is a code I use in template:

<?php $amp_content = new AMP_Content(get_sub_field('content'), amp_get_content_embed_handlers( get_post() ), amp_get_content_sanitizers( get_post() ));
echo $amp_content->get_amp_content(); ?>

Maybe I’m wrong and there is a simpler way to achieve that?
Many thanks.

p.s. still waiting for update on this issue.