Yep, you should be able to insert a YouTube embed into your slide content, e.g:
<iframe width=”560″ height=”315″ src=”https://www.youtube.com/embed/lqaN0kfufP8″ frameborder=”0″ allow=”accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture” allowfullscreen></iframe>
So on your YT video, click on ‘SHARE’, and then click ‘EMBED’.
Also make your your Slide Anything editor is in TEXT mode (and not visual editor)
Am marking this topic as resolved.