Quillbot premium cookie method is a little different.
When you going to use Quillbot premium cookies After importing the cookies you have to refresh the page. Then You have to press Esc button after 1 or 2 seconds Don’t let the Quillbot website Completely load itself. If the website load completely then it will not work.
Here’s the cookie link - https://file-link.net/190244/quillbotcookie
The Link is Tested & is 100% working. If it’s not working for you then you’re doing it wrong. Follow the instructions properly & always use a good browser.