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It can't be done, you can contact Whatsapp with your suggestion, since this is a third party app, it's up to them, whatsapp developers, to address this issue and/or add this feature.
I agree with @Phy, based on your previous thread
http://talk.sonymobile.com/t5/Xperia-SP/Storage-problem/m-p/1110508#M36526
you don't have enough internal storage, a suggestion, just manually move the whatsapp folder from the internal storage to the SD card
then
on the internal storage > whatsapp > media > look for the photos and videos and empty the folders
another suggestion, uninstall facebook and use it with chrome, it will smooth things out.