Uploader.php

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<?php
declare(strict_types=1);

namespace Magento\Backend\Block\Media;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Serialize\Serializer\Json;
use Magento\Framework\Image\Adapter\UploadConfigInterface;

class Uploader extends \Magento\Backend\Block\Widget
{
    protected $_config;

    protected $_template = 'Magento_Backend::media/uploader.phtml';

    protected $_fileSizeService;

    private $jsonEncoder;

    private $imageConfig;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\File\Size $fileSize,
        array $data = [],
        Json $jsonEncoder = null,
        UploadConfigInterface $imageConfig = null
    ) {
        $this->_fileSizeService = $fileSize;
        $this->jsonEncoder = $jsonEncoder ?: ObjectManager::getInstance()->get(Json::class);
        $this->imageConfig = $imageConfig ?: ObjectManager::getInstance()->get(UploadConfigInterface::class);

        parent::__construct($context, $data);
    }

    protected function _construct()
    {
        parent::_construct();

        $this->setId($this->getId() . '_Uploader');

        $uploadUrl = $this->_urlBuilder->addSessionParam()->getUrl('adminhtml/*/upload');
        $this->getConfig()->setUrl($uploadUrl);
        $this->getConfig()->setParams(['form_key' => $this->getFormKey()]);
        $this->getConfig()->setFileField('file');
        $this->getConfig()->setFilters(
            [
                'images' => [
                    'label' => __('Images (.gif, .jpg, .png)'),
                    'files' => ['*.gif', '*.jpg', '*.png'],
                ],
                'media' => [
                    'label' => __('Media (.avi, .flv, .swf)'),
                    'files' => ['*.avi', '*.flv', '*.swf'],
                ],
                'all' => ['label' => __('All Files'), 'files' => ['*.*']],
            ]
        );
    }

    public function getFileSizeService()
    {
        return $this->_fileSizeService;
    }

    public function getImageUploadMaxWidth()
    {
        return $this->imageConfig->getMaxWidth();
    }

    public function getImageUploadMaxHeight()
    {
        return $this->imageConfig->getMaxHeight();
    }

    protected function _prepareLayout()
    {
        $this->pageConfig->addPageAsset('jquery/fileUploader/css/jquery.fileupload-ui.css');
        return parent::_prepareLayout();
    }

    public function getJsObjectName()
    {
        return $this->getHtmlId() . 'JsObject';
    }

    public function getConfigJson()
    {
        return $this->jsonEncoder->encode($this->getConfig()->getData());
    }

    public function getConfig()
    {
        if (null === $this->_config) {
            $this->_config = new \Magento\Framework\DataObject();
        }

        return $this->_config;
    }

    public function getUploaderUrl($url)
    {
        return $this->_assetRepo->getUrl($url);
    }
}