I want to upload a file before posting data but brings an error. "Uploaded file does not exist at temporary location: D:\\xammp\\tmp\\phpa020.tmp"

<?php
session_start();
error_reporting(E_ALL);
ini_set('display_errors', 1);

require_once('../includes/db.php');
require_once('../includes/config.php');
require_once('../includes/generators.php');
require_once('../includes/modals.php');

ConnectToDatabase();

$table = 'users';
$user_id = 'user_id';
$userId = $_SESSION[$user_id];

$successMessage = null;
$post_id = null;

if (isset($_SESSION['post_data'], $_SESSION['post_files'])) {
    $_POST = $_SESSION['post_data'] ?? null;
    $_FILES['fileUpload'] = $_SESSION['post_files'] ?? null;
}

if (isset($_POST["type"]) && isset($_POST["pageId"])) {
    // Get common form data
    $title = isset($_POST["title"]) ? $_POST["title"] : "";
    $description = isset($_POST["desc"]) ? $_POST["desc"] : "";
    $type = $_POST["type"];
    $privacy = isset($_POST["privacy"]) ? $_POST["privacy"] : "";
    $price = isset($_POST["price"]) ? $_POST["price"] : "";
    $pageId = $_POST["pageId"];
    $pageUuid = isset($_POST["pageUuid"]) ? $_POST["pageUuid"] : "";
    $schedule_from = isset($_POST["datesFrom"]) ? $_POST["datesFrom"] : "";
    $schedule_to = isset($_POST["datesTo"]) ? $_POST["datesTo"] : "";
    $fileNumber = isset($_FILES['fileUpload']) ? count($_FILES["fileUpload"]["name"]) : 0; // Initialize $fileNumber
    $createdAt = date("Y-m-d H:i:s");
    $updatedAt = date("Y-m-d H:i:s");
    $shareLimit = (int) $_POST['share_limit'];

    function guidv4($data = null)
    {
        // Generate 16 bytes (128 bits) of random data or use the data passed into the function.
        $data = $data ?? random_bytes(16);
        assert(strlen($data) == 16);

        // Set version to 0100
        $data[6] = chr(ord($data[6]) & 0x0f | 0x40);
        // Set bits 6-7 to 10
        $data[8] = chr(ord($data[8]) & 0x3f | 0x80);

        // Output the 36 character UUID.
        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
    }

    $postUuid = guidv4();
    $taggedUserIds;
    $blockedUserIds;

    // Check if the post type is 'message'
    if ($type === 'text') {
        $commentChecked = isset($_POST['commentCheckbox']) && $_POST['commentCheckbox'] === 'on';
        $commentValue = $commentChecked ? 1 : 0;

        $stmt = $mysqli_link->prepare("INSERT INTO page_posts (`post_uuid`, `page_uuid`, `pageId`, `ownerId`, `description`, `tagged`, `blocked`, `type`, `title`, `price`, `schedule_from`, `schedule_to`, `fileNumber`, `allow_comments`, `privacy`, `createdAt`, `updatedAt`, `share_limit`)
                                                VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?,?)");
        $stmt->bind_param("ssissssssssiissssi", $postUuid, $pageUuid, $pageId, $userId, $description, $taggedUserIds, $blockedUserIds, $type, $title, $price, $schedule_from, $schedule_to, $fileNumber, $commentValue, $privacy, $createdAt, $updatedAt, $shareLimit);
        if ($stmt->execute()) {
            // Get the inserted post's ID
            $post_id = $stmt->insert_id;

            $messageContent = isset($_POST["text_message"]) ? $_POST["text_message"] : "fff";
            $stmt2 = $mysqli_link->prepare("INSERT INTO page_posts_texts (post_id, text_message) VALUES (?,?)");
            $stmt2->bind_param("is", $post_id, $messageContent);
            if ($stmt2->execute()) {
                $successMessage = "Posted successfully";
            } else {
                $dangerMessage = 'Text Not posted';
            }
        } else {
            $successMessage = "Error posting message.";
            echo "Error: " . $stmt->error;
        }

        $stmt->close();
    } else {
        // Handle other post types (image, video, book) only if files are present
        if ($fileNumber > 0 && isset($_FILES['fileUpload'])) {
            $taggedUserIds = isset($_POST['taggedUsers']) && !empty($_POST['taggedUsers']) ? implode(', ', array_map('intval', $_POST['taggedUsers'])) : "";
            $blockedUserIds = isset($_POST['blockedUsers']) && !empty($_POST['blockedUsers']) ? implode(', ', array_map('intval', $_POST['blockedUsers'])) : "";
            $commentChecked = isset($_POST['commentCheckbox']) && $_POST['commentCheckbox'] === 'on';
            $commentValue = $commentChecked ? 1 : 0;

            $stmt = $mysqli_link->prepare("INSERT INTO page_posts (post_uuid, page_uuid, pageId, ownerId, description, tagged, blocked, type, title, price, schedule_from, schedule_to, fileNumber, allow_comments, privacy, createdAt, updatedAt, share_limit)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");
            $stmt->bind_param("ssissssssssiissssi", $postUuid, $pageUuid, $pageId, $userId, $description, $taggedUserIds, $blockedUserIds, $type, $title, $price, $schedule_from, $schedule_to, $fileNumber, $commentValue, $privacy, $createdAt, $updatedAt, $shareLimit);

            if ($stmt->execute()) {
                // Get the inserted post's ID
                $post_id = $stmt->insert_id;

                // Handle file uploads for image, video, book posts
                for ($i = 0; $i < $fileNumber; $i++) {
                    $FileName = $_FILES["fileUpload"]["name"][$i];
                    $FileTempName = $_FILES["fileUpload"]["tmp_name"][$i];
                    $uploadError = $_FILES["fileUpload"]["error"][$i];

                    if ($uploadError !== UPLOAD_ERR_OK) {
                        $dangerMessage = 'File upload error for file: ' . $FileName . ' (Error code: ' . $uploadError . ')';
                        continue;
                    }

                    // Define the folder for storing uploaded files
                    $folder = __DIR__ . '/posts/images/';
                    if (!file_exists($folder)) {
                        mkdir($folder, 0777, true);
                    }

                    // Define the target path for the uploaded file
                    $targetPath = $folder . $FileName;

                    // Check if the uploaded file exists
                    if (file_exists($FileTempName)) {
                        // Attempt to move the file to the destination
                        if (move_uploaded_file($FileTempName, $targetPath)) {
                            // File moved successfully
                            // Proceed with inserting file details into the database
                            // Example: Insert into page_posts_images (post_id, file_path) VALUES (?, ?);
                        } else {
                            // Error moving file
                            $dangerMessage = 'Error moving file: ' . $FileName;
                            continue; // Skip to the next file
                        }
                    } else {
                        // Uploaded file does not exist at temporary location
                        $dangerMessage = 'Uploaded file does not exist at temporary location: ' . $FileTempName;
                        continue; // Skip to the next file
                    }
                }
            } else {
                $dangerMessage = "Error posting content.";
            }

            $stmt->close();
        } else {
            $successMessage = 'No files found';
        }
    }
}

echo json_encode($dangerMessage);
?>

I want to upload a file before posting data but brings an error. "Uploaded file does not exist at temporary location: D:\\xammp\\tmp\\phpA020.tmp"