Please help! Workdocs in another workdoc

Hi everyone, I am having a problem to put a workdoc file in another workdoc…

https://www.youtube.com/watch?v=FKxdF1N09q8

In the promotional video, we can clearly see the option and functionality, but acctualy there is no option.
Can you guys help me?



Upvote. We still don’t have this feature as well.