Depot
Arknights Guide
So what is the Depot in Arknights? This area is another word for your inventory, and you can access this section after you have completed the tutorial. Any rewards that you get, resources that you farmed, and all of your currency can be seen here.
By default, all your items are listed on the first tab. The other tabs contain consumables, basic items, and growth materials.The items that you can have can be permanent items until used, while there are some items that you have that are timed items so they will expire so make sure to use them.