I purchased the Ultimate edition this game, so I think I have all the DLC for it. I've already played Warden's Keep and The Stone Prisoner. From what I understand, Return to Ostagar is something I can just do in the main campaign as well.
What about the ones where you can, according to the Wiki, "import" a character from Origins, like Golems of Amgarrak? Is this something that I can do while in the main campaign, or is it something that can only be played separate?