I'm certainly no expert on this, but usually the link will expire after the given time frame. So the fact thar the link was active suggests that you made it in time. The easiest way to check is log on to the LNER profile you created when you applied. Mine says "interviews completed : 1", which can only be the video interview
I haven't received this email, nor have I received anything saying I've been rejected. My LNER profile says my application has been submitted and still gives me the opportunity to withdraw it, so I'm presuming I'm still in the running. Anyone else in this boat?