Does not save cookies, what should the unfortunate person do?

Question

HTTP Cookies

Good, I decided to learn a little about cookies, but something is not going according to plan (I threw the coockie folder into the domains in the open server, everything is beautiful, but when I put the cookie and output it to the console, my cookie is shown. Everything would be fine, but the application coockie is empty, and if you remove the installation of this cookie from the code, then document.coockie is empty ((((I'm confused, help dear