How to drop a player from one platform to another?

Hello Unity Developers,
I’m a new in game development and I’m currently making a 2d infinite runner. I want to make the player to jump or drop from one platform to another. I’m already done with the jump part and now I’m having a problem of how to make my character drop. My solution is to remove the player’s collision when the down arrow pressed so that it can pass through the platform where it is standing. Is my solution right or is there another/correct way of doing it?

Do you have rigid body with gravity enabled with you character?
If no, try this one.