Dose upload file API support create/insert a file?

Now I can upload a file that is exist in local from Postman by using Box upload file API.

But I want to create a txt file by Postman, in form-data body I set the attributes ({"name":"test.txt", "parent":{"id":"0"}}), and set the file ("file (text)": "file context", not select a file from local), it returns 400.

How to send the request including the new txt file name and the new file content to create a file in Box?

Thanks.