by Ariden Lei.
The problem is solved.
You are right. It has been working normally. Just that I did not know how to add the activity. I should click "select content" and search something. And then, save and return to the course.
You are right. It has been working normally. Just that I did not know how to add the activity. I should click "select content" and search something. And then, save and return to the course.