Just tested this. Apparently you can buy things with Silver (Bought a sparrow) on one platform and on the platforms you've cross saved with, the item will be in your inventory. Got no idea if this is just a thing with Vehicles/Shaders/Emotes and not Armor, where as if you have bought armor with silver, the rolled perk stays on 1 Platform. Need clarification on this from a Community Manager if possible Thanks for reading!