When you unlock a new slot, it will appear in all inventory categories. You can only store ONE of the following in that slot

  1. A Blueprint Card or a Wild Card
  2. A Redraw Card
  3. An Upgrade Card

As soon as you buy or win a card of any category and store it, the free slot is automatically removed from the other categories. Basically, the same slots are used for all 3 categories. So if you have 5 slots, you have 5 slots for all 3 categories, not 5 slots for each type of item.

P.S.

  • When you install a blueprint or use (spend) a card, its slot becomes vacant.
  • If you remove an installed blueprint from the car, it returns to storage and occupies a slot.