PVC again for the win, damn this is a great site.
Nick Lear has an awesome article on using an iPhone 13 as a B Cam and the pitfalls it entails and how he got it to work. And the things you don’t realize, like yes you can and should shoot with ProRES, but if you do you can’t shoot in LOG in Filmic Pro and the possibility of using Cinematch to help with balancing.