The XML file within the assets folder defines all the files used in the Muse file, so my guess is that the OAM import process is having issues handling those new folders in /accordian/ since they are not listed.
If you are just trying to embed this document within a Muse project, you could use the absolute URL of the exported JavaScript file. Here’s a bit more info on that process, which involves first hosting your exported document on the web: Howto: Embedding an OAM widget within Adobe Muse