You cannot directly import user stories into Studio Pro. You can import user stories as Sathya explains.
Once you have imported the user stories, you can get them in Studio Pro. You need to make sure that the active sprint has user stories, then press refresh in Studio Pro.
This is the collaboration space in home.mendix.com:
This is in Studio Pro:
The nice thing about this functionality is that in Studio Pro you can read the user stories and tasks and you can adjust the status of user stories in Studio Pro (from '” “running” to “done” for example).
Hope this also helps!
We can upload user stories using Excel , on the stories navigation you can find more button on right side if you click there is a option to Export/Import stories .
Please refer this documentation for step by step guidance .
Hope this helps!