Uploading zipped storyline files did not work, even when I gave the story.html file as the start up it simply didn't work.
I tested it with 4 people - a mixture of internal and clients. Only one successfully used the tool correctly. Those who were not 'tech-savvy' simply didn't 'get it' despite me giving instructions and using the help.
There are too many options for reviewing - I think simple is best, no need for comments, boxes, etc. Just click on the screen and add a comment.