How do I set a sprite to fill the entire screen in UI?

I’ve got myself in a little bit of a pickle. I have a sprite under a canvas but ALT + SHIFT + clicking the scale in bottom right of rect transform doesn’t scale it to full screen for some weird weird reason. It works for images, but not sprites. I need to use a sprite because I’m using the sprite in conjunction with some sprite masks to create a shadow effect. Unfortunately, images don’t work with sprite masks, only sprites do.

I believe I can scale sprites in code, and I think I remember doing it before, but it just seems silly that my sprite won’t scale to the screen size under a canvas the same way an image will. Perhaps image is UI compatible and sprite is not, and I didn’t realize that? I’m not sure.

When I say sprite vs image, I mean applying the sprite renderer vs the image components. Thanks in advance if you can help. I will probably have to end up stretching my sprite in code :frowning:

I ended up using this script, I can’t figure out how to snap it to the edges but oh well…

using System.Collections;
using System.Collections.Generic;
using UnityEngine;


public class FitScreen : MonoBehaviour {
    // Initialize
    private int screenWidth;
    private int screenHeight;
    private Vector2 screenSize;

    // Update is called once per frame
    private void LateUpdate() {
        // Update screen width and height
        screenWidth = Screen.width;
        screenHeight = Screen.height;
        screenSize = Camera.main.ScreenToWorldPoint(new Vector2(screenWidth * 2, screenHeight * 2));

        // Stretchy
        transform.localScale = screenSize;