Your theory is sound, this could be it.
The whole thing with Zane and a possible flashback, i guess i simply see it differently, it can be a moment where the MC and Erynn have an honest conversation and it brings them closer together rather than a downer, like getting over a big bump, something that has been holding her back and is in the back of the MC's mind as well.
And honestly i can see a scenario where we are both correct... we start exploring the phone with Erynn next to us, and when we click play the perspective changes from simply watching a screen to "inside the scene".