I am planning to design a bookbinder with airgap rigid flex PCB using Altium.
Based on guidelines from Altium, and various other sources, it is important to have "staggered lengths", to prevent the PCB from buckling when it is bent.
However, I can not see any documentation on how to stagger the lengths. I have contacted a PCB manufacturer and they have suggested that you might need different gerber files. Is the best option to essentially produce a separate PCB for each flex layer? I have included my WIP stackup. Note there is an air gap in between flex layers, but this is not shown by Altium.