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I'm trying to add an endpoint to unattached media items. This is what I hope to achieve:

example.com/attachment-slug/foo/

...where foo is the endpoint I'm trying to add.

Here's my code:

add_action( 'init', function() {
    add_rewrite_endpoint( 'foo', EP_ATTACHMENT );
} );

add_action( 'template_redirect', function() {
    global $wp_query;
    if ( ! isset( $wp_query->query_vars['foo'] ) ) {
        return;
    }
    include dirname( __FILE__ ) . '/my-template.php';
    exit;
} );

This doesn't seem to work because when I visit example.com/attachment-slug/foo/ I get a 404.

How can I add an endpoint to unattached media?

1

EP_ATTACHMENT will insert rules for things attached to posts (and custom post types), but not unattached media.

You can make this work by adding it to EP_PAGES instead-

add_rewrite_endpoint( 'foo', EP_PAGES );

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