This property displays the actual numbers of bytes written to disk.

The value of TotalBytes is always less than or equal to the MaxBytes property .

If there is more than one file being uploaded in a single page, only the first one is displayed.

To examine the Total Bytes written of multiple files in a single upload, there is an equivalent property for each file object, i.e., fileUpload.Form("FILE1").TotalBytes. Please see SAFile.TotalBytes