Because it uses the original 2014 engine, save files from the vanilla Dark Souls 2 are typically compatible with the 360 Scholar edition, which is not true for the current-gen "True Scholar" versions. Summary of Version Differences Dark Souls 2: Scholar of the First Sin Review

Enjoy the punishment! Praise the Sun! \[T]/

To ensure the DLC and updates work, files must be placed in the specific internal HDD directory structure: Game Folder (Disc 1): Typically placed in Hdd1:/Games/Dark Souls II SOTFS/ DLC & Compatibility Pack (Disc 2):

Tested working.