XD files get shredded on CC files
They show up as directories and cannot be downloaded.
The best way to share your XD file(s) is to choose “Share for Review” which publishes the file as a viewable prorotype. You can also choose “Invite Edit” which makes the file accessible to anyone you add for access. You can find more info here, https://helpx.adobe.com/xd/help/share-embed-designs-prototypes.html#Shareclouddocuments
Divya Thakur commented
Thanks for contacting us. It's not a XD related bug and it seems like you have already posted this issue. Let the creative cloud team to handle it.