Im on level 879 and get get how the cherries fall down?

Carla_Tenney

I have all 3 of them over the openings where the arrows point down but can't understand what makes them fall thru, other candid are falling but not the cherries

LKay

You have to get the keys to open the locked row, then the cherries have to fall through the middle 3 where the arrows are (hard to see arrows)