With MP Grid Inventory you can easily add an inventory system to your project, for solo or multiplayer.
You can add/move/drop/equip items from your inventory, using a grid based system like in classic RPG.
This is made for single and multi player games.
Preview: https://www.youtube.com/watch?v=-D7s6aDjx8I
Documentation: https://docs.google.com/document/d/13NcGyX4t07IN0X5qGHOzUtN7MgNqSTWz65SKTnThK2o/edit?usp=sharing