Restrict FTP upload file sizes

Server 2008 R2 with IIS and FTP roles installed.

I tried setting the Maximum Content legnth in the FTP Request Filtering Settings, but it did not allow me to restrict the uploading file size, only the downloading file size.  Uploading is from an external source to the server.

Is there a way to limit the file size upload but not the file size download in IIS FTP role?

Thanks,

Todd