@olesolo,
LifterLMS does not have any way to embed slideshows into a lesson directly.
You can do it with some additional work or with a plugin. Here’s a pretty in depth guide on different methods of adding slideshows to a WordPress post or page (all of these methods will work with a lesson).
https://www.ispringsolutions.com/blog/4-ways-to-embed-powerpoint-presentations-on-a-wordpress-website/
We usually recommend recording the slideshow as a video and embedding it into your lesson that way. The plugin recommendations here would be the second best recommendation. However I don’t actively test against any slideshow plugins and while they SHOULD work, I cannot promise you that they will work. I’m recommending you give it a shot but I am not making that recommendation as a guarantee!
Hope that helps,
