Add Content Before Image/Download on Attachment Post

Hello there,
I’d like to add a function to my child theme’s function.php file that adds the following content (an image wrapped in a link) to all posts with the “p.attachment” class. For reference this is where media posts and downloads from the plugin “Download Monitor” which I am using appear.

Here is the content I’d like to add after/underneath the image or download attachment:
<a href="https://google.com" target="_blank"><img src="image.png"></a>

I found this post which is trying to do something similar but to no avail in trying to make it work:

The PHP referenced from that post:

<?php
function filter_attachment_content($content) {
if(is_singular('attachment')){
	$acf = get_field('fieldtitel');
}
return $content.$acf;
}
add_filter('the_content', 'filter_attachment_content');

Thanks in advance for any help I can receive on this!

• This topic was modified 5 years, 7 months ago by AD.