FAL/TCA

        'file' => array(
            'exclude' => 1,
            'label' => 'Datei',
            'config' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig('file', array(
                'appearance' => array(
                    'createNewRelationLinkTitle' => 'Datei hinzufügen'
                ),
                'minitems' => 0,
                'maxitems' => 1,
            ), $GLOBALS['TYPO3_CONF_VARS']['GFX']['imagefile_ext']),
            ),
        'files' => array(
            'exclude' => 1,
            'label' => 'LLL:EXT:medialibrary/Resources/Private/Language/locallang_db.xlf:tx_medialibrary_domain_model_entry.files',
            'config' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig('files', array(
                'appearance' => array(
                    'createNewRelationLinkTitle' => 'Dateien hinzufügen'
                ),
                'minitems' => 0,
                'maxitems' => 3,
            ), $GLOBALS['TYPO3_CONF_VARS']['GFX']['imagefile_ext']),
        ),