Squid - how to whitelist WhatsApp file transfer?

[NW4FUN]

Hello,

I've configured Squid transparent (SSL) proxy and added the ACL ftp://ftp.ut-capitole.fr/pub/reseau/cache/squidguard_contrib/blacklists.tar.gz
Having selected SOCIAL NETWORK as category to block, unfortunately blocks whatsapp file transfer

I've added .whatsapp.com and .whatsapp.net to both whitelist and SSL bump. Whilst it allows whatsapp messaging, I cannot get the file transfer (video, photo, files, etc.) to work.

Any hint?