[ffpip]

>When you send a video to a contact on WhatsApp, it takes some time to upload the video. When you then forward the video a ..

It's actually not instant. I've tested this multiple times. Maybe you had a spike in upload speeds suddenly when forwarding?

[oarsinsync]

Thanks, I’ve edited the comment to better reflect that it’s near instant rather than actually instant.

I’ve done a packet capture to verify that my phone is not uploading the entire payload a second time when forwarding media I’ve recently uploaded or received, which is what compounded my original concern.