SkiaSharp canvas.Draw

I am trying to draw a bitmap that contains image info. I want to draw the bitmap so that it is drawn on the full surface of the screen. Here is the code I have currently:

    /// <summary>
    /// Paints the surface of the canvas view with the dictionary of paths that has been created
    /// </summary>
    private void PaintCanvasViewSurface(object sender, SKPaintSurfaceEventArgs args)
    {
        canvas = args.Surface.Canvas;

        float gridHeight = (float)imageGrid.Height;
        float gridWidth = (float)imageGrid.Width;
        size = new SKSize(gridWidth, gridHeight);
        rect = SKRect.Create(size);

        canvas.DrawBitmap(bitmap, rect, null);

        foreach (SKPath path in completedPaths)
            canvas.DrawPath(path, paint);

        foreach (SKPath path in inProgressPaths.Values)
            canvas.DrawPath(path, paint);
    }

This works on UWP, but on Android only draws the bitmap so that it takes up 1/3 of the height and 1/3 of the width. canvas.DrawBitmap(bitmap, 0, 0) works on Android, but produces an undersized image on UWP.

Any suggestions or alternative approaches?

Thanks in advance.