Why does it prompt that the file does not exist when I use the post method of the APIRequestContext object to upload a form file?

[1219213291]

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[1219213291]

Hello guys!
I am trying to upload a form file using the post method of the APIRequestContext object, just like in the official documentation.

api_request_context.post(
  "https://example.com/api/uploadScript'",
  multipart={
    "fileField": {
      "name": "f.js",
      "mimeType": "text/javascript",
      "buffer": b"console.log(2022);",
    },
  })

Here is my test code snippet:

api_request_context.post(
    url=https://localhost/api/upload'",
    multipart={
        "files": {
            "name": "Changed_FROR.xlsx",
            "mimeType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
            "buffer": open(file_path,"rb").read(),
        },
        'systemId': 'arg1',
        'code': 'test_code'
    }

).json()

My backend service is unable to retrieve the corresponding file and prompts that the uploaded file cannot be empty.
Because I need to call some API interfaces before running my automated test cases to quickly and reliably complete the setup operations, in order to shorten the runtime. So this is a very efficient and commonly used operation. I don't know if there's an issue with my usage or if this is a bug, and I hope someone can help clarify. Otherwise, I'll have to use the request library as a substitute.