Created blank theme for REST API, featured image not appearing on admin side

I have a blank theme purely to redirect to my custom front-end. I created a functions.php and put add_theme_support() inside it and to no avail.

index.php:

<meta content=”0; URL=’https://headless-cms.test”” http-equiv”refresh”>

<!– just in case the meta tag is not read properly, here is plan B: a JS redirect –>
<script type=”text/javascript”>
window.location = ‘https://headless-cms.test’;
</script>

functions.php

add_action( ‘after_setup_theme’, ‘headless_theme_setup’ );
function headless_theme_setup() {
add_theme_support( ‘post-thumbnails’);
}

// Also tried these and still didn’t show

//add_theme_support(‘post-thumbnails’, array(
// ‘post’,
// ‘page’,
//));
//add_theme_support( ‘post-thumbnails’ );

I refreshed the admin panel and checked under screen options and did not see it. I’m using WP 5.0.2.

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