BLUESKY_DSN=bluesky://nyholm.bsky.social:[email protected]

use Symfony\Component\Notifier\Bridge\Bluesky\BlueskyOptions;
use Symfony\Component\Notifier\Message\ChatMessage;

$message = new ChatMessage('My message');

// Add website preview card to the message
$options = (new BlueskyOptions())
    ->attachCard('https://example.com', new File('image.jpg'))
    // You can also add media to the message
    //->attachMedia(new File($command->fileName), 'description')
    ;

// Add the custom options to the Bluesky message and send the message
$message->options($options);

$chatter->send($message);