No one let's you transfer dlc cross platform just like you have to buy the game again you have to buy the dlc again. Same platform normally it does. Battlefield premium on my ps3 moved to my ps4 no problem but I had to buy the ps4 game again. I think one reason may be the fact that some platforms have timed exclusive content so it makes a simple db move situation a lot more complicated.
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Im ok with buying it again.