public byte[] DownloadAs(string format, string userId, string documentId)
{
//https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/resources/onedrive
//https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/api/driveitem_get_content_format
//https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/resources/driveitem
var urlRoot = $"https://graph.microsoft.com/v1.0";
var url = $"{urlRoot}/users/{userId}/drive/items/{documentId}/content?format={format}"; // Currently only supports PDF
var responseBodyBytes = _restClient.getResponseAsBytes(url);
return(responseBodyBytes);
}
