Show video instead of thumbnail

post-video-thumbnail.txt

1) Create ACF field - oEmbed and attach to the Posts
2) Add the below code in active child them's functions.php

function single_post_thumb_before( $post_id, $settings ) {
	?>
	<div class="custom uael-post__thumbnail">
		<?php echo get_field( 'posts_video_thumbnail', $post_id ); ?>
	</div>
	<?php
    
} 
add_action( 'uael_single_post_before_thumbnail', 'single_post_thumb_before', 10, 2 );

Note - Please replace the 'posts_video_thumbnail' wit the ID of your custom field.

3) Add the below CSS - 

.uael-post__thumbnail{
    display: none;
}

.custom.uael-post__thumbnail{
    display: block;
}

4) This will show the Video at the Posts thumbnail - https://cl.ly/7a9905f3caed.