Help, why this pattern doesn't get applied to the rectangle plane?

im quite new to sketchup, when i drew a rectangle behind the pattern it doesnt get applied to the plane, i tried to intersect face it doesnt work either
the pattern is imported from autocad (but i made sure its all flattened already), and sry for bad english

Hard to say without seeing the SketchUp model.

What version of SketchUp are you using? There is no free plan of 2018 as you put in your forum profile. Or are you using a cracked version?