Tile can't snap to another tile in tileset

Hello everybody, I'm new to 2D development and I can't find an answer to this solution. There's one platform that i need to attach to my ground tile. my tile is 32 x 32 size and the flat platform is 32 x 10 , unity automatically align the tile to the middle of the platform and this cause the tile to be floating. any solution???
Link to the picture: https://drive.google.com/file/d/1rZRxJfN6-Lpz5u2gd6TOOT1WSVu5eAUw/view?usp=sharing