Don't allow next button to be active until all of embedded video is watched

Hello Anne, 

Happy to help!

Since embedded videos are hosted on a third-party site, there isn't a way for Storyline 360 to detect if one of their videos has finished playing. The closest workaround would be to match the length of the timeline with the duration of the video and restrict the seekbar so that your learners will be required to view the video in its entirety. You can then addd triggers to make the next button available at the end of the timeline. 

Of course, the best solution would be to download a copy of the embedded video if you are able and to add the video from a file. This will give you full control over how the video interacts with the rest of the slide. 

Let me know if you have any questions!