....

protected function getDataUploadField()
{
    return [
        'arguments' => [
            'data' => [
                'config' => [
                    'componentType' => 'fileUploader',
                    'formElement' => 'fileUploader',
                    'component' => 'Magento_Ui/js/form/element/file-uploader',
                    'dataScope' => 'file',
                    'fileInputName' => 'image',
                    'uploaderConfig' => [
                        'url' => $this->urlBuilder->addSessionParam()->getUrl(
                            'adminhtml/attachements_file/upload'
                        ),
                    ],
                ],
            ],
        ]
    ];
}

....

<?php

namespace VendorModuleControllerAdminhtmlAttachements;

abstract class File extends MagentoBackendAppAction
{

    const ADMIN_RESOURCE = 'Magento_Catalog::products';
}

<?php

namespace VendorModuleControllerAdminhtmlAttachementsFile;

use MagentoBackendAppAction;
use MagentoFrameworkAppFilesystemDirectoryList;

class Upload extends VendorModuleControllerAdminhtmlAttachementsFile
{
    protected $UploaderFactory;

    public function __construct(
        MagentoMediaStorageModelFileUploaderFactory $UploaderFactory,
        ActionContext $context

    ) {

        $this->UploaderFactory = $UploaderFactory;
        parent::__construct($context);
    }

    public function execute(){

        $uploader = $this->UploaderFactory->create(['fileId' => 'image']); //ERROR

        $uploader->setAllowedExtensions(['jpg', 'jpeg', 'gif', 'png']);

        $uploader->setAllowRenameFiles(false);

        $uploader->setFilesDispersion(false);

        $path = $this->_filesystem->getDirectoryRead(DirectoryList::MEDIA)
        ->getAbsolutePath('images/');

        $uploader->save($path);

    }
}