Since I started collaborating with Ember, I created two promotional videos and started working on a new series of 4!
They provided some of the assets and the scripts of all the videos.
I find that showing the work-in-progress is really important, especially when it comes to explainer and promotional videos.
To do so, I usually use a platform that allows my clients to add comments or request changes to the videos at the timestamp they want. This makes communication so much easier!