I'm sorry you are experiencing issues with editing your course content. Are you referring to a free course that was published before 2020 and exceeds 2 hours of video content? If yes, unfortunately, you won't be able to edit it. You can find more information here.
If that's not the case, it's hard to tell what's happening there, and I encourage you to contact our support here, and the team will look into that for you 😊.
Thank you so much for your cooperation, and please let us know if you have additional questions.