Because of the horror stories on this forum I have put a dashcam in both cars.
If I got in a crash I want to be confident of what to do so I don't ruin the footage and capture it properly.
Do you just pull the sim card out after the crash? The latest moments are always saving?
Depends on your dashcam. Some are always recording but will only save the last X seconds when it detects a crash or a bump. You can also trigger it by pressing a button on the dashcam. You'll notice on many dashcam vids on YouTube a distinct chime after an accident is captured and occasionally the dashcam being slightly moved as someone manually triggers it when they are recording a 3rd party crash.
If you are in a crash just make sure a chime has gone off but it's worth also manually pressing it out of caution.