If you finished editing the learning material you must finalize it otherwise it won't be available for students.

You can find a warning message about the availability of learning material. You must press the "Finalize" button to make it available for your students. 

We suggest you to play the content even during the editing or after the finalizing. It is for controlling the visualized learning material. Use the "Play" button on the left side menu, which can be pressed at any time. This is the student view of the learning material. 

You don't have to play all of the content at any time. There is an oppurtinity for playing only one chapter. Use the playing button on the right side of the chapter.