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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

<?php
/**
 * Webkul Software
 *
 * @category  Webkul
 * @package   Webkul_PrivateShop
 * @author    Webkul Software Private Limited
 * @copyright Webkul Software Private Limited (https://webkul.com)
 * @license   https://store.webkul.com/license.html
 */

namespace Webkul\PrivateShop\Model\Config\Backend;

use Magento\Framework\Exception\LocalizedException;

/**
 * System config image field backend model
 */
class Image extends \Magento\Config\Model\Config\Backend\File
{
    /**
     * Save uploaded file before saving config value
     *
     * @return $this
     * @throws LocalizedException
     */
    public function beforeSave()
    {
        $maxSize = 2000000;
        $fileData = $this->getFileData();
        $value = $this->getValue();
        if (!empty($fileData)) {
            $uploadDir = $this->_getUploadDir();
            if ($value['size'] >= $maxSize) {
                throw new LocalizedException(
                    __('The file you\'re uploading exceeds the server size limit.')
                );
            }
            try {
                /** @var Uploader $uploader */
                $uploader = $this->_uploaderFactory->create(['fileId' => $fileData]);
                $uploader->setAllowedExtensions($this->_getAllowedExtensions());
                $uploader->setAllowRenameFiles(true);
                $uploader->addValidateCallback('size', $this, 'validateMaxSize');
                $result = $uploader->save($uploadDir);
            } catch (Exception $e) {
                throw new LocalizedException(__('%1', $e->getMessage()));
            }
            if ($result !== false) {
                $filename = $result['file'];
                if ($this->_addWhetherScopeInfo()) {
                    $filename = $this->_prependScopeInfo($filename);
                }
                $this->setValue($filename);
            }
        } else {
            if (isset($value['error'])) {
                if ($value['error'] == 1) {
                    throw new LocalizedException(
                        __('The file you\'re uploading exceeds the server size limit.')
                    );
                }
            }
            if (is_array($value) && !empty($value['delete'])) {
                $this->setValue('');
            } elseif (is_array($value) && !empty($value['value'])) {
                $this->setValue($value['value']);
            } else {
                $this->unsValue();
            }
        }

        return $this;
    }
    /**
     * Getter for allowed extensions of uploaded files
     *
     * @return string[]
     */
    protected function _getAllowedExtensions()
    {
        return ['jpg', 'jpeg', 'gif', 'png'];
    }
}