How does RISE store attached pdf files when exported for web or LMS?

Hi there, John! That's a great question!

When you upload a file to an attachment block in Rise 360, that file is stored on our servers. The direct link to the attached file that begins with https://articulateusercontent.com/rise/courses/. is pointing to the file stored on the server, so the link will continue to work even after you publish the file and host it on your LMS or web server. The link will only be broken if you permanently delete the course from Rise 360. 

We also mentioned a similar solution for PDF storage in this article: Make Your PDF Pop in Rise 360

Please let me know if that answers your question!