Based on the experience of our users, it is possible to use Learndash and Publitio together.
There are many ways to embed and complete integration, you need to find one that works for you.
We suggest trying to turn off HLS ( if you have the HLS option turned on) for your videos and paste the plain .mp4 link in Learndash.
Also, we cannot guarantee 100% compatibility with every plugin for WordPress - this is beyond our technical support.
Want more help? You can try checking out our tutorial on LearnDash