将图像上传到第二台服务器（基于symfony的网站）

I am having problems with some code. I have 2 servers. Server 1 and Server 2. My website (gallery with thousands of pics) is being hosted on Server 1 and I want all images to be hosted on Server 2.

I already copied all images to the second server and edited my parameters so that my website gets all images from Server 2.

The problem is that when I upload new content, all images get uploaded to Server 1 instead of Server 2 which means I would need to copy everything every time which is a lot. I need to edit the following code so it will upload to Server 2.

<?php

namespace AppBundle\Provider;

use AppBundle\Entity\Item\Item;

class ImageUploadPathProvider
{
    const SERVER_IMAGE_ROOT = '/home/DIRECTORY1/DIRECTORY2';

    public function getItemOriginalPath(Item $item)
    {
        return sprintf(
            '%s/images/%s/original/%s',
            self::SERVER_IMAGE_ROOT,
            $item->getGallery()->getDirectory(),
            $item->getFilename()
        );
    }


    /**
     * @param Item $item
     *
     * @return string
     */
    public function getItemThumbnailPath(Item $item)
    {
        return sprintf(
            '%s/images/%s/thumbnail/%s',
            self::SERVER_IMAGE_ROOT,
            $item->getGallery()->getDirectory(),
            $item->getFilename()
        );
    }
}