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I have somee Item in the media library, where I want to retrieve the thunbnail from. I use the normal post thumbnail functions (tried some of them), with normal posts or cpts's the work fine.

As media library items are handled, similiar to posts, I thought the normal wp thumb function could work there, too. There are also thumbs created, as i can see on the server.

But no one fo WP's Thumb Fuunctions returns that thumb.

Here an example Function, I use:

 <?php echo get_the_post_thumbnail($post->ID, 'size-1'); ?>

The post ID is correct. The Thumbnail size is registered and works for other posts fine.

Thank YOu!

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wp_get_attachment_image($post->ID, 'size-1');

The "post thumbnail" actually gets the featured image that is attached to the post. For an attachment, you want the attachment itself in a specific size, which isn't the same as the featured image.

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