Eugene Generalov

<label><input type="checkbox" name="floor()" value="1">1</label>
<label><input type="checkbox" name="floor()" value="2">2</label>
<label><input type="checkbox" name="floor()" value="3">3</label>
<label><input type="checkbox" name="floor()" value="4">4</label>

if($_GET['floor']) {
$filter["floor:IN"] = implode(",", $_GET['floor']);;
}

if($_GET['size']) {
$filter["size:="] = $_GET['size'];
}

<select name="select-value">
<option value="Нужный текст">Нужный текст</option>
</select>

//Select
if($_GET['select-value']) {
    $filter[] = "tv_name:=".$_GET['select-value'];
}

$filds['source'] = $modx->getOption('ms2_product_source_default', null, 1);

$response = $modx->runProcessor('gallery/upload', array('id' => $idDoc, 
	$_FILES["file"], 
	'media_source' => $modx->getOption('ms2_product_source_default')), $otherProps);

$otherProps = array(
   'processors_path' => $modx->getOption('core_path') . 'components/minishop2/processors/mgr/'
);
$response = $modx->runProcessor('gallery/upload', array('id' => $res->get("id"), $_FILES["file"]), $otherProps);    
if ($response->isError()) {
   $modx->log(modX::LOG_LEVEL_ERROR, $response->getMessage());
}