"The Will of Ashan" - "Heart of Darkness" [2nd campaign, 5th mission]

Yeah, thanks bro, I just pressed the "central" button and clicked around))))

Added 3 minutes later
And here's another question:
When you win, a list of creatures appears at the top, which are supposedly raised from corpses into undead, with the possibility of upgrading them and adding them to your troops using dark energy.
Sometimes you can upgrade two squads and move them to your side, and sometimes you can only upgrade them, but you can't move anyone.
What determines this?