As far as I can tell, this is broken in the FMB (amongst a plethora of other things). The bridge pieces will hook though. You may be able to get it to work through the notepad though.
Just take a gander at the large German industrial building for instance. When you hook the other pieces they will get sucked together, but when you look at them on the map in 3d view the other pieces are actually sitting on the ground (not on the concrete pad).
The bridge piece hook points are all green (aka they will hook in any which way) while the building pieces are mostly red (I'm guessing some sort of error).
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