How to show thumbnails on index?

  • My WP theme calls for thumbnails on the index but I don’t use a preferred image so it won’t show thumbnails.

    <?php the_post_thumbnail('excerpt-thumbnail', 'class=alignleft'); ?></a>

    I’m using a SEO plugin which autogenerates a videothumbnail. This thumbnail is showed when a post is shared on Facebook.

    This is the code:

    <link rel="image_src" href="https://www.url.com/wordpress/wp-content/uploads/2012/12/jpg50-300x225." />

    How can I display this thumbnail (aligned left) for each post on my index?

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