Leadde (https://leadde.ai) generates an explainer video with avatar and voice from a document or presentation.

Choice of avatar and voice, form of presentation and editing of the script text.
Ability to create your own avatar and voice.

Once the video has been generated, a chatbot is present to query the content.

Sharing by url and mp4 export.

In the free version, 10 minutes of video per month, 1 avatar and a personalized voice.

Document-based testing, source: framework for the use of AI in education

Test from the first 5 slides of this presentation: AI, education and training: challenges and prospects for the educational community, Education, digital technology and research

Personal avatar test with voice cloning: