xhrUploader settings function cannot set authorization header because request not open

[zekenie]

Version: 2
I'm trying to upload to an API that requires an authorization header, similar to the strategy referenced in the documentation.

I define my uppload object like this:

const uppload = new Uppload({
  lang: en,
  defaultService: "local",
  uploader: xhrUploader({
    endpoint: `${process.env.API_URL}/attachments`,
    settingsFunction(xmlHttp) {
      xmlHttp.setRequestHeader("authorization", Auth.getToken());
    }
  })
});

I get the following error:

Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED.

When I look at the code for the xhrUploader, it seems like the settingsFunction is called after the XMLHttpRequest is instantiated but before it is opened. Since the request is not open, I cannot set my header.