This article explains WhatsApp's auto-download video feature, how to enable it, how to find downloaded videos, and where to find old WhatsApp videos that aren't in the Photos app.
These steps work anywhere you can use WhatsApp, including your phone and computer.
Saving WhatsApp videos is much easier if you’re using the desktop or web version. Those instructions are at the bottom of the page, but first, let’s take a look at how it works in the mobile app:
You’ve probably noticed that you can’t just tap and hold on a video to find a download or save option. Instead, by default, all incoming media is automatically saved to your device and can be accessed just like any video you’d shoot yourself: through the Photos app.