Thank you for your message, and sorry for my late reply (due to annual holiday).
Cubasis supports top use external devices to import and export projects and other files. However, it is not possible to run active projects externally.
To learn more about the topic, please refer to the MediaBay chapter of the Cubasis in-app help:
https://download.steinberg.net/downloads_software/Cubasis/Cubasis_3_Web_Help/MEDIA.html
Best,
Lars