Accessibility issue:Articulate courses as Embedded Web Objects not seen by screenreader

I am trying to ensure that a new web resource we are developing is accessible. Part of the course uses presentations, activities etc. made in Articulate Storyline 2. These are published in HTML5 and added to the course via CourseBuilder as Embedded Web Resources. When checking the site with the NVDA free screen-reader software on FireFox and Google Chrome, the screenreader will recognise that there is an object there and read the title (which is what I was told needed to happen to make to content visible to screenreaders) but the content is skipped entirely. How can this be resolved? Is it an issue with the settings when publishing the document (like how a PDF needs the tags checked manually and fixed up) or are Articulate documents only accessible when viewed through Articulate Player?
Link to web resource at:
www.auckland.ac.nz/writeatuni

Articulate documents are at 

0.3

2.7

2.11

3.8

3.11

4.6

4.7

4.11

4.14

5.1

and the webcomic (viewable through clicking a link under any of the comic pages, for example 1.1).