Documentation for chatSession.sendAttachment() is incomplete about amazon-connect-chatjs HOT 5 CLOSED

function uploadFile()
{
  if (!chatSession)
  {
    return;
  }

  var input = document.createElement('input');
  input.type = 'file';

  input.onchange = e => {

    var file = e.target.files[0];
    chatSession.sendAttachment({
      attachment: file
    }).then(function(data) {
      console.info('Upload complete');
    })
    .catch(function(error) {
      console.error('Failed to upload', error);
    });
  }

  input.click();
}

private async convertUriToFile({
    uri,
    fileName,
    fileType,
  }: {
    uri: string;
    fileName: string;
    fileType: string;
  }): Promise<File> {
    const filePath = Platform.OS === 'ios' ? uri.replace('file://', '') : uri;
    const fileData = await RNFetchBlob.fs.readFile(filePath, 'base64');

    // Works from here

    const byteCharacters = decode(fileData);
    const byteNumbers = new Array(byteCharacters.length);
    for (let i = 0; i < byteCharacters.length; i++) {
      byteNumbers[i] = byteCharacters.charCodeAt(i);
    }
    const byteArray = new Uint8Array(byteNumbers);
    const blob = new Blob([byteArray], {type: fileType});

    return new File([blob], fileName, {type: fileType});
  }

  export interface ImagePickerResponse {
    didCancel?: boolean;
    errorCode?: ErrorCode;
    errorMessage?: string;
    assets?: Asset[];
}

  private convertAssetToFile = async (asset: {
    uri: string;
    fileName: string;
    type: string;
  }): Promise<File> => {
    try {
      const resp = await fetch(asset.uri);
      const blob = await resp.blob();
      return new File([blob], asset.fileName, {type: asset.type});
    } catch (error) {
      throw error;
    }
  };