PHP code does not start when the page is loaded - php

Question

I made the code below to show the files that were inserted by the user, however it only shows the files after having attached a file, however I wanted it to show when loading the page, for the user to see what files he has already uploaded. Here is the code I used to upload the file:
<center><p class="text-success" style="font-size: 20px; padding-bottom: 100px;">
<?php
session_start();
require_once('conecta.php');
$email = $_SESSION['email'];
if (isset($_POST['enviar'])) {
$arq = $_FILES['arquivo']['name'];
$dataup = date('Y-m-d H:i:s');
echo $dataup;
$arq = str_replace(" ", "_", $arq);
$arq = str_replace("ç", "c", $arq);
if (file_exists("uploads/".$arq)) {
$a = 1;
while (file_exists("uploads/[".$a."]".$arq)) {
$a++;
}
$arq = "[".$a."]".$arq;
}
if (move_uploaded_file($_FILES['arquivo']['tmp_name'], 'uploads/'.$arq)) {
$objDb = new db();
$link = $objDb->conecta_mysql();
$sql = "insert into arquivos (email_vol, nomearq) values ('". $email."', '".$arq."')";
if (mysqli_query($link, $sql)){
echo 'Plano de aula 1 enviado com sucesso!';
} else {
echo (mysqli_error($link));
echo 'Erro ao enviar o plano de aula!';
}
} else {
echo "Nenhum arquivo selecionado!";
}
}
?>
</p></center>
Here is the code to show the file on the page:
<?php
session_start();
require_once('conecta.php');
$pasta = "uploads/";
$consulta = mysqli_query($link, "SELECT * FROM arquivos WHERE email_vol = '$email'");
while ($resultado = mysqli_fetch_array($consulta)) {
echo "" . $resultado["nomearq"] . "<br />";
}
?>
Can someone give me a hand? Thank you very much in advance.