Too bad you didn't save your footage as soon as it happened by pressing the camera button on the bottom menu.
The car may save footage automatically too but for an incident that you know just happened, best to do it manually too.
Edit: I just read this thread.
This morning I was hit from behind on I-93 North in southern NH when traffic slowed and then stopped. It scraped paint off and maybe dented my pristine bumper, and smashed the right hand reflector. Minimal if any damage to his car - the license plate hit my bumper. We pulled over to the...
teslamotorsclub.com
Yeah, the accident may be recorded on that drive after all. Nice!