Html

<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>

<?php
$d=dir("files");
while ($entry = $d->read()) {
    if(($entry!=".")&&($entry!="..")){
  echo "<a href='files/$entry'>$entry</a><br>\n";
}

}
$d->close();

?>
<form action="copy.php" method="post" enctype="multipart/form-data">
<input name="file" type="file">
<input name="submit" type="submit" value="Загрузить">
</form>
</body>
</html>