in the technical faq there is a note: We have added a synchronization background software service that syncs multimedia contents (pictures, videos, audio, files…) and settings to a cloud drive, when activated.
Not sure why it was not included but you need to install the Nextcloud app. use ecloud.global as the server and log in with your e.email credentials then you have the app to browse AND your cloud files will magically now be available in the Files app.