pdf file doesn't load: This XML file does not appear to have any style information associated with it. The document tree is shown below.

It appears to be a problem with the location of the pdf.  I have gotten a similar message from S3 if I forget to set the folder to pubic access.  If I am reading the URL correctly, it appears that the pdf is not in the same spot as the project. that could be caused by linking to it instead of putting it in resources. A file in resources is packaged during publishing. That means it is copied, and uploaded as part of the project. If it is just a link, the published destination may not have access to the original.

Of course, I'm just guessing. Someone who can see the .story file may be able to give you a better answer.  Attach it here, and see what you get.