How is the Black Skylands warehouse used?
Inventory management is a mechanic in most games that you have to learn to live with, otherwise you're going to have a rough time.
Black Skylands is no exception. You need to access a warehouse so you can dump the supplies there and be able to access them from another location. The Black Skylands warehouse is essentially an endless vault, containing 1.000 items. Eve has no storage/personal inventory, which means you can't store resources in it. You must manually pick up an item or resource and reach the nearest warehouse to deposit it by pressing the button that appears.
Once the resource is inside, it will be safely stored and can be accessed from any storage you come across in the future. However, for this, you will have to find a warehouse elsewhere. To access the warehouse, just approach it and press the button that appears.
While holding something, you cannot fire weapons or use melee attacks. You can only use the grappling hook. This is inconvenient if the enemies are still nearby and you have found a resource quite far from the reserve.
Your aircraft has a cargo bay, from which you can reach the hold, where all the things the ship needs are stored -weapons, repair kits, etc.- and the warehouse, being able to go from one to the other.