How to block upload / download of files at whatsapp

I've enable the block option at app control signatures of whatsapp download / upload options and active DPI-SSL, but didn't work.
Does anyone have tried to block upload and download of files, pictures, videos of whatsapp or other aplication? Using app control or other metod?
I'm using a tz 270.
Category: Firewall Security Services
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@rodrigo_007
yes, you can do that through the App Control.
Navigate to the App Control —> Select the IM Category —> Application: WhatsApp —> viewed by: Signature
Then block the signatures for Upload & Download signatures.