无法使用c＃WebClient和php FILES上传文件

The following C# code is used to upload the json file (~3.6 MB) to the server. Here, I am using WebClient to upload file to the server.

 private void btnUploadToServer_Click(object sender, EventArgs e)
        {
            try
            {
                using (WebClient client = new WebClient())
                {
                    string filePath = @"C:\Users\SAKTHY-PC\Desktop\app_erp_suneka.json";
                    var serverPath = new Uri(@"http://example.com/newSync/upload.php");
                    client.UploadFile(myUri,filePath);
                }

                   Application.Exit();
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }

And I have a php script file (upload.php) in the following folder http://example.com/newSync/

<?php
    $filepath = $_FILES["file"]["tmp_name"];
    move_uploaded_file($filepath,"app_erp_suneka.json");
?>

The problem is unable to upload 2MB or more than 2MB file to the server. But less than 2MB file is successfully uploaded.

You need to check and increase theese variables on your PHP server (php.ini file):

post_max_size => 8M
upload_max_filesize => 2M

Check it in phpinfo() or in server console:

php --info | grep upload_max_filesize
php --info | grep post_max_size
php --info | grep php.ini <-- shows where php.ini is

And control your php-log -- all errors and warnings are shown here:

php --info | grep error_log <-- where error_log is