Unfortunately this feature is not available on Edpuzzle at the moment. However, we have a suggestion!
We recommend changing the title of the videos and adding indicators at the end like "Part 1 of 3", "Part 2 of 3", etc. In doing this, students will know how many videos they have to watch, and know which order to watch them in.
Learn how to change the title of an assignment here: https://support.edpuzzle.com/hc/en-us/articles/360007543852-Can-I-title-my-video-