The final campaign has been launched!

I have a question. I completed the final mission of "Angels Also Weep" playing as Nastya. I completed it without the bonus, and I didn't really need it. But now, how do I get to the second mission, "Too Bright for Darkness"? I've already pinned the mission twice, and then I go back to the main menu (because that's all I can do – either load or go to the main menu). I go back into the campaign, select Nastya and the other heroes, but the second mission still can't be selected. What do I need to do to start playing the second mission of the final campaign? Please help, because I'm completely stumped...