I have a multibody part composed by sheet-metal a welding frame element, I trying to use smart fastener but solidworks doesn't detect sheet surface and put bolt only on frame members. anyone knows why?

I have a multibody part composed by sheet-metal a welding frame element, I trying to use smart fastener but solidworks doesn't detect sheet surface and put bolt only on frame members. anyone knows why?

Some pictures explaining problem

Thanks in advance who may help me and others with this issue

SolidworksAssemblies