PHP Image Upload Issue: Replacing Previous Image When Uploading Multiple Posts with Images

I'm facing an issue with my PHP application's image upload functionality. The scenario is as follows:

I have a form where users can create a post and upload an image associated with the post.
When I upload the first post with an image, everything works fine, and the image is correctly saved to the server Folder name Uploads with a name (e.g., post1_image.jpg).
However, the problem arises when I try to upload a second post with a different image but having the same name as the first image (e.g., post1_image.jpg). Instead of saving it as a new image, it replaces the previous image associated with the first post.
How can I modify my PHP code to ensure that each uploaded image gets a unique name and doesn't overwrite any existing images? Here's a simplified version of my current PHP code for handling the image upload:

<?php 
include "config.php"; // Connection with server
// File Upload
if (isset($_FILES['fileToUpload'])) {
$Errors = array();
$File_Name = $_FILES['fileToUpload']['name'];
$File_Size= $_FILES['fileToUpload']['size'];
$File_Tmp = $_FILES['fileToUpload']['tmp_name'];
$File_Type = $_FILES['fileToUpload']['type'];
$File_ext = end(explode('.',$File_Name));
$Extensions = array('jpeg','jpg','png');
if (in_array($File_ext,$Extensions) === false) {
$Errors[] = "This file is not allowed to upload. You can only upload jpeg , jpg and png";
}
if ($File_Size > 2097152) {
$Errors[] = "you cant upload file of size greater then 2MB";
}
if (empty($Errors) == true) {
move_uploaded_file($File_Tmp,"upload/". $File_Name);
}else{
print_r($Errors);
die();
}
}
session_start();
$Title = mysqli_real_escape_string($conn,$_POST["post_title"]);
$Description = mysqli_real_escape_string($conn,$_POST["postdesc"]);
$Category = mysqli_real_escape_string($conn,$_POST["category"]);
$date = date("D M,Y");
$Auther = $_SESSION['name'];
$sql = "insert into post (title,description,category,post_date,author,post_img) values ('{$Title}', '{$Description}', {$Category}, '{$date}', '{$Auther}','{$File_Name}');";
$sql .= "Update category set post = post+1 where category_id = $Category;";
// $result =  mysqli_multi_query($conn, $sql) or die ("Query unsucceful"); 
if (mysqli_multi_query($conn, $sql)) {
mysqli_close($conn);
header('Location: http://'.$hostname.'/cms/admin/post.php');
}else {
echo "Query Failed";
}
?>

Any insights or suggestions on how to resolve this issue would be greatly appreciated! Thank you!

You can use the uniqid() function to ensure that each uploaded image gets a unique name.

> move_uploaded_file($File_Tmp,"upload/".uniqid().$File_Name);