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I added a template php to my Wordpress site, showing a basketball image from url, I'd like this to be the thumbnail of my website when sharing on social media

My php template-

    <?php

/*
*Template Name: demo
*Template Post Type: post, page
*/

get_header();


$image = 'https://ff.com/basketball.jpg';
$imageData = base64_encode(file_get_contents($image));
echo '<img src="data:image/jpeg;base64,'.$imageData.'" alt=“image description” title=“image tooltip”>';
?>

When I load my website , I see a basketball image thanks to this template. But when I share my website I have no thumbnail

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