I have a set of boards I wanted to try and do a flex between. The boards are 3.7" and the flex is 3.2" wide, 4 layers between them (rigid boards are arbitrarily set at 14 layers right now). Flex section is checked off as flex in layer stackup. I put a bending line in-but it won't change the affected shaded area or bend in 3d when I use the fold slider at all. What is going on with my bending line? (I've tried moving it around etc with no luck)
Looks like rigid and flex areas are correctly assigned. Did you mark one of the 2 rigid parts as "Locked"? That is the equivalent of "grounding" in Inventor, and a requirement for bending since the flexible parts will be bent around this static part.