In Studio, you can edit courses that are running and courses that are archived. If you don’t see the course you were editing before, check under "archived", maybe the course is there.
When the end date of your course is in the past, your course will be archived. It is still accessible for learners who were enrolled in the course, and you can also edit the course.
A course will show up if you share the course information here:
A course will show up if you selected "both" in the "course visibility" under advanced settings
Yes, you choose the licence in Studio.
If you have filled in the course information and the required publication date is in the past, please contact us.
You can upload videos on YouTube, Vimeo, Streamable, or another (free) service. Check these websites for a discussion on several video hosting services:
https://kinsta.com/blog/video-hosting/, https://www.veed.io/learn/video-hosting
Many websites nowadays disable embedding them in iFrames, you can check that in the HTTP response header X-Frame-Options of the site. If its value is "DENY or SAMEORIGIN", then an iFrame won’t work.