Simple file upload feature in my website won't work, (405 Not Allowed)

I have a droplet and a website in /var/www/html/

index.html:

<!DOCTYPE html> <html lang=“en”> <head> <meta charset=“UTF-8”> <title>PHP File Upload</title> </head> <body> <form action=“fileUploadScript.php” method=“post” enctype=“multipart/form-data”> Upload a File: <input type=“file” name=“the_file” id=“fileToUpload”> <input type=“submit” name=“submit” value=“Start Upload”> </form> </body> </html>

and fileUploadScript.php:

<?php $currentDirectory = getcwd(); $uploadDirectory = “/uploads/”;

$errors = []; // Store errors here

$fileExtensionsAllowed = ['ttf']; // These will be the only file extensions allowed 

$fileName = $_FILES['the_file']['name'];
$fileSize = $_FILES['the_file']['size'];
$fileTmpName  = $_FILES['the_file']['tmp_name'];
$fileType = $_FILES['the_file']['type'];
$fileExtension = strtolower(end(explode('.',$fileName)));

$uploadPath = $currentDirectory . $uploadDirectory . basename($fileName); 

if (isset($_POST['submit'])) {

  if (! in_array($fileExtension,$fileExtensionsAllowed)) {
    $errors[] = "This file extension is not allowed. Please upload a .ttf file";
  }

  if ($fileSize > 16000000) {
    $errors[] = "File exceeds maximum size (16MB)";
  }

  if (empty($errors)) {
    $didUpload = move_uploaded_file($fileTmpName, $uploadPath);

    if ($didUpload) {
      echo "The file " . basename($fileName) . " has been uploaded";
    } else {
      echo "An error occurred. Please contact the administrator.";
    }
  } else {
    foreach ($errors as $error) {
      echo $error . "These are the errors" . "\n";
    }
  }

}

?>

so when someone visits my website he can upload a file on my webserver (droplet) but and error appears “405 Not Allowed nginx/1.18.0 (Ubuntu)”. How can I fix this???