[Rakan Shaker]

Just stumbled on this while searching for something else, but the VR comp editor creates 3 comps when you add an edit. In order to extend the timeline, you’ll need to double click the precomp it made, extend that comp’s timeline (you have to unlock the layers), then open the third comp (which just has your original content) and extend that, then go back to comp 2 pull out both layers to match, and the same thing for all layers in your original “EDIT” comp. Hard to explain in just words, but I hope that helps.