Additional question .... is there a way to determine the full file name including the path of a file BEFORE uploading it, and then use the full name to check the file size using the FileSystem extension for example?
i don't see any file uploaded. any working tutorial demonstrate upload/download?
You can follow instructions on this: http://www.outsystems.com/help/servicestudio/9.1/index.htm#t=Web_User_Interface%2FAbout_Upload_Widget.htm
It also links from there to additional info.