We need more context to properly answer your question. You might be talking about importing and exporting stories in your project? If not, please elaborate.
https://docs.mendix.com/developerportal/collaborate/stories#import-export
point 6.6 of Learning Path (Rapid D.) talks about uploading a user storie (excel) in Studio PRO. The Documentation you linked describes how to upload it from studio, but where can I upload story in Studio PRO?