ReactFileUpload.js

// Redux action
export function uploadSuccess({ data }) {
  return {
    type: 'UPLOAD_DOCUMENT_SUCCESS',
    data,
  };
}

export function uploadFail(error) {
  return {
    type: 'UPLOAD_DOCUMENT_FAIL',
    error,
  };
}

export function uploadDocumentRequest({ file, name }) {  
  let data = new FormData();
  data.append('file', document);
  data.append('name', name);

  return (dispatch) => {
    axios.post('/files', data)
      .then(response => dispatch(uploadSuccess(response))
      .catch(error => dispatch(uploadFail(error));
  };
}

/*
 ... A lot of Redux / React boilerplate happens here 
 like mapDispatchToProps and mapStateToProps and @connect ...
*/

// Component method
handleFileUpload({ file }) {
  const file = files[0];
  this.props.actions.uploadRequest({
     file,
     name: 'Awesome Cat Pic'
  })
}
  
// Component render
<input type="file" onChange={this.handleFileUpload} />

// Component method
handleFileUpload({ file }) {
  const file = files[0];
  this.props.actions.uploadRequest({
     file,
     name: 'Awesome Cat Pic'
  })
}

should be

// Component method
handleFileUpload({ target: files }) {
  const file = files[0];
  this.props.actions.uploadRequest({
     file,
     name: 'Awesome Cat Pic'
  })
}