In your attempt you have simply set the width of the image to be 100%...and it will automatically size the height to keep the proper aspect ratio. This will often cause the image to flow over to the next page because most cover images are taller than they are wide. That's why an svg wrapper works so well. It automatically maximizes the image to fill the screen with the proper aspect ratio. (assuming you use the settings I provided above).
I actually keep this as a template...all I need to do is enter the exact image dimensions and it always works.
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