According to particle physics  , every fundamental force has its force carrier particle. Photon is a force carrier particle of electromagnetic force but how does force gets transmitted when a iron is brought near magnet quantum mechanically  ?

Why does magnet starts applying force when it is brought near iron but does not apply any force on any other substance  ?

Why does magnets attractand repel each other from point of view of quantum and particle physics  ?
And why do they get attracted to iron objects from the point of view of quantum physics  ?

According to particle physics, every fundamental force has its force carrier particle. A photon is a force carrier particle of electromagnetic force, but how does force get transmitted when iron is brought near magnet quantum mechanically?

Why does a magnet start applying force when it is brought near iron, but does not apply any force on any other substance?

Why do magnets attract and repel each other from the point of view of quantum and particle physics?
And why do they get attracted to iron objects from the point of view of quantum physics?