Why doesn't the session persist in Laravel 5.4?

Question

Laravel

Hello.
I have this problem:
session is not saved

Session::put('test', 'Test Session');
var_dump(Session::get('test')); // Сессию видно

But as soon as I comment out the
//Session::put('test', 'Test Session');
session disappears.

Answer 1

why is the call static?
It is not tied anywhere and it lives until the end of the work once.
https://laravel.com/docs/5.4/session#using-the-session
or is storage not configured?

Answer 2

1) Is the middleware for starting sessions for the web environment registered?
2) Is stateful session storage being used? Or statesles like array?