How do I increase the touch area of a Sprite?

I have a game where people can drag and drop stuff and most of these objects(sprites) are pngs in different forms. The problem is some of these items are small or narrow so you need to be pretty precise to get them moving.

1. I tried to increase the transparent area of the sprites but the transparent area doesn't take the touch input.

2. I created an invisible item with a bigger area to be dragged with the sprite I have but then it doesn't show when the item is being dragged around which is pretty lame.

Can anyone help me with this one, please?

1. If you increase the transparent area of the sprite, you need to also increase the collision polygon.

2. You can use a big invisible sprite with Drag&Drop behavior, and pin the actual visible sprite to it.

Thanks a lot! I didn't know about collision polygons at all.