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Yesterday we were told some players delete saves from time to time to free the disk space. However, if you do that, you may delete the files needed for import between the DLCs. To avoid that, make sure you keep the saves named "ForImport..."
ForImport saves from the end of the main campaign can be choosen when you start a new DLC game.
But a final ForImport DLC save will be imported into the main game automatically, next time you load the main game save. It will happen in background, you won't get any import interfaces, but you will get a new adility when you get your first Mythic level.
Also if you finished the DLC as a Lich and unlocked a reward, then next time you play chapter 5 of the main game as a Lich, the skull pillar will give it to you.