scaleTo on output is always 1080p

Shotstack API
3

Thanks for responding back. I’m creating a 1080x1920 vertical video.

    "output": {
        "format": "mp4",
        "size": {
            "width": 1080,
            "height": 1920
        },
        "scaleTo": "sd"
    }

So this is my output but when I run this I don’t get the smaller file size and the resolution it’s always the same file with 1080p resolution.