Problem seems to be in the browser...

If you are trying to upload files to your web server and it does not work, check the web browser version.

Microsoft Internet Explorer Version 4.71.1712.6 does not work at all. If you install a different version of IE, it will work. Or use Netscape/Firefox!

Problem seems to be on the server...

For syntax, refer to the documentation of the TwhBasicApp.OnUploaded Event.

To set a limit on the maximum file size for uploads, use ZMAdmin, under Connectivity Layer > Runners > (your runner id) > Upload MaxFileSize (kb).

If you are using Apache and runbin, you have an additional option which is to enforce the limit within Apache, before the entire file is transmitted, thereby saving time and bandwidth. Reference http://www.cyberciti.biz/faq/apache-limiting-upload-size/.