Unfortunately nope, Whatsapp doesn't have a setting to automatically use the SD card for media storage. You can, however, 'hack' the phone into thinking that the SD Card is part of the internal memory, thus basically expanding your phone's storage (akin to 'Adoptable Storage' in newer versions of Android).
Unfortunately, I don't know exactly how to do this, but a Google search should help. Also, remember, doing this is not without risks. SD Cards aren't that reliable, they're usually slower than your on-board storage, and should you remove the card (or it fails or gets corrupted), apps that had data there could possibly become unusable and, of course, you could lose data.
01-09-2017 12:08 PM