Trim Sprite Memory Usage

Hi there,
I have a question about Trim sprites.

Let’s say I have a 1024x1024 png.
Most areas are empty pixels except for an area in of 256x256.
I can see that the trim is working fine (256x256) when I add it into the Canvas.

When the game is build, the memory used for this sprite is from what size?
The trimed 256x256 or original 1024x1024?

Currently running on v2.4.13
Thanks.