File size of the specified item of the upload list.
value = getImageUploader("ImageUploaderID").getUploadFileSize(Index);
A positive integer which specifies an index of the upload list item (i.e. the upload file). An index is 1-based. In other words valid value is in range [1, UploadFileCount].
A non-negative integer value that specifies a file size of the specified upload list item.