Hi Karsten,
Thanks for your message.
Files app support, introduced with the latest Cubasis 2.4 / Cubasis LE 2.4 version updates, allows to browse, search and organize Cubasis released files on the iPad, in iCloud Drive and across other cloud services (such as Dropbox or similar).
Please have a look at our Cubasis 2.4 tutorial (at around 8:08 minutes) to see the feature explained in a practical use case:
_On a side note:
The Cubasis Project Importer, which comes as a free download from the Steinberg website, is required and allows to import Cubasis projects with supported Cubase versions (please find it here: Cubasis Project Importer | Steinberg). Here is a handy tutorial from our friends at MusicAppBlog that explains the workflow: http://musicappblog.com/cubasis-workshop-1/_
Hope that helps.
Best wishes,
Lars