I've got a weird problem that I can't seem to get any straight answers about.
So, I export the zip package from Rise, and then upload that zip file into Canvas and accept when it asks if I want to expand. I then right-click on the index.html file inside the expanded folder I just uploaded and use that link on a page to open that content in a new browser tab (target="_blank").
In one instance of Canvas, the link redirects to "https://a14178-19087.cluster203.canvas-user-content.com/+string of stuff" and the content is visible without issue. In the other, the link redirects to "https://instructure-uploads-pdx.s3.us-west-2.amazonaws.com/+string of stuff" and I see only a blank page.
I contacted Instructure support about this problem previously and they were able to fix it in the instance where it does work but I'm not sure what the fix was or if it was just a staging issue where the files have to be moved by some process to a server that can serve them up.