I am trying to use UlrFetch to submit CSV data to Zoho reports. I am using the following code:

```
function doImport(tabla,file) {
  var url="https://reportsapi.zoho.com/api/xxxxxxxx/yyyyyyyyyyy/"+tabla;
  var ticket="zzzzzzzzzzzzzzzz" ;//getTicket();
  url=url + "?ZOHO_ACTION=IMPORT&ZOHO_OUTPUT_FORMAT=XML&ZOHO_ERROR_FORMAT=json&ZOHO_API_VERSION=1.0"
  var params={"ZOHO_API_KEY":"vvvvvvvvvvvvvvvvvvvvvv"
              ,"ticket":ticket
              ,"ZOHO_FILE":file
              ,"ZOHO_IMPORT_TYPE":"APPEND"
              ,"ZOHO_ON_IMPORT_ERROR":"ABORT"
              ,"ZOHO_AUTO_IDENTIFY":"true"
              ,"ZOHO_CREATE_TABLE":"false"
              ,"ZOHO_DATE_FORMAT":"dd-MM-YYYY"
              ,"ZOHO_DELIMITER":"0"
             };

  var options =
    {
      "method" : "post",
      "payload" : params,
      "contentType": "multipart/form-data"
    };
  var response=UrlFetchApp.fetch(url, options);
  var tableDataString=response.getContentText();
  expireTicket(ticket);
  Logger.log(tableDataString);
  return tableDataString;
}

```

However, the data is not submitted in correct multiform format (getting error 500 status). This issue backtracks to [early 2011](http://productforums.google.com/forum/#!searchin/apps-script/urlfetch%2420multipart/apps-script/qpJCDYtaSDQ/e4gqaaaq-AMJ). Please, one or two examples of how to submit blob files in multipart/form-data format would be welcome.

Thanks