Problem when uploading file from React to Laravel

I'm trying to upload a file from reactjs project to Laravel backend.

In react I have it set up like this (components are from reactstrap):

<FormGroup>
  <Label for="invoice">
    <IntlMessages id="words.invoice" />
  </Label>
  <Input
    type="file"
    name="invoice"
    onChange={this.handleInvoiceChange}
  />
</FormGroup>;

and in handleInvoiceChange I set the file to state

handleInvoiceChange = e => {
  this.setState({
    formData: {
      ...this.state.formData,
      invoice: e.target.files[0]
    }
  });
};

and sending form to server

submitForm = () => {
  const formData = { ...this.state.formData };
  console.log("send data", formData);
  axios.post(`items/edit/${this.itemId}`, formData).then(response => {
    console.log(response);
  });
};

When sending form to server, I check the data in console:

In laravel, I try to dump file with

$invoice = $request->file('invoice');

dd($invoice);

But this is always empty. What am I missing here?

via Chebli Mohamed