I have been struggling with setting this up for Sharepoint. There's one step on this tutorial that can't be done due to EDS own limitations:
"Since the sidekick library is hosted on the same origin as the content, a static HTML page needs to be created to load and configure the content."
If you try to do that, you'll get an error when trying to preview/publish that static .html file:
415 Unsupported Media Type

I found an ugly workaround for now, but this should be fixed (either documentation or the technical issue) to avoid others waste their time like I did :)