Antivirus Filter not working

Hi, I have attached Antivirus filter to the policy and trying to test if filter is applied correctly but looks like the file is getting downloaded without any issue. Below is the sample configuration. I tried both, proxy and flow based configurations but no luck. I am using FG version 6.0.8 Please advice what could be the issue.

config antivirus profile

 edit "default"

 set comment "Scan files and block viruses."

 set inspection-mode proxy

 config http

 set options scan

 end

 config ftp

 set options scan

 end

 config imap

 set options scan

 set executables virus

 end

 config pop3

 set options scan

 set executables virus

 end

 config smtp

 set options scan

 set executables virus

 end

 config mapi

 set executables virus

--More-- end

 config nntp

 set options scan

 end

 next

end