Not sure a video walk through is needed since that would be a huge video but, at least some more detailed instructions. For example, I have the lasted versions of Mobile App code, Android SDK, and NodeJs installed. Ran the npm install. Seems there were still several updates that needed to happen so, did those too. 

I attempted to simply open the default UNA just to test and here is the error:

If you hit reload, this is the error:

Keep in mind, I have not modified ANY files. So it seems something else is needed or there is a configuration that needs to be done that isn't mentioned in the instructions.