Untitled

<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <title>test</title>
</head>
<body>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>

<form method="post" enctype="multipart/form-data">
    <input type="file" name="file" accept="text/*" required>
    <input type="submit" value="Отправить">
</form>

</body>
</html>