Debugging

If you get an error with this message: Invalid response that means the server is not sending a valid JSON fromat. This may be caused from a PHP error. Here is want you can do to see what's causing that (using Google Chrome):

If you get errors in the Console tab about the Origin request make sure in server/upload_*.php you accept the request from where you send it by adding:

header('Access-Control-Allow-Origin: yourwebsite.com');
header('Access-Control-Allow-Origin: www.yourwebsite.com');

If you get server errors about the file size, make sure you change the settings for upload_max_filesize and post_max_size in php.ini