The Silo is one of the structures that you can find in your island that is used for storage of resources.

The Silo stores the crops and fruits that you harvest.

Tap the Silo to see what is stored inside it.

This is the Silo storage window. In the bar at the top, the number on the left is how many items you have stored. The number on the right is the total space you have for storage.

You can upgrade your Silo to increase its storage capacity by having the required storage parts. The best ways to obtain storage parts are:

• fill guest orders at the Order Board (they sometimes give you bonus parts)
  
• sent Guides and Guests to Landmarks (such as the Coral Reef and Hot Spring)
  
• open Treasure Chests at the Sunken Temple

You can instantly upgrade your storage using Gems instead of storage parts.