尝试在Wordpress中显示自定义文件夹中的图像时出错404

I have the following shortcode which gets the images of that post (that will be in a folder named as the post's id ) and displays them echoing as many tag images as needed.

    session_start();
    $postID = $_SESSION['post_ID'];
    $upload_dir = wp_upload_dir();
    $path = $upload_dir['basedir'].'/'.'gallery/'.$postID;

    if(file_exists($path)) {
        $pathFile = $path.'/*';
        $images = glob($pathFile);
        if(!empty($images)) {
            foreach($images as $image){
                $alt = end(explode('/', $image));
                echo '<img src="'.$image.'" alt="'.$alt.'" />';
            }
        } else echo 'No hay imágenes.';

    } else echo 'No hay imágenes.';

?>

The problem is that the images aren't displayed, i get the followin error in the brower's console GET https://path-to-theme/wp-content/uploads/gallery/1658/wwg.jpg 404, per every image and i get this icon:

image

I have no idea why my images aren't displayed the images, the path is correct, the images are there, complitely no idea what I'm missing. It's not a permissions problem as i tried giving 755 permissions to the directories starting from /uploads/.. and so on including the images.