Inventory System: Simple Drag and Drop Inventory System in Blueprints - UE Marketplace (unrealengine.com)

Observation Toolbox is a framework for quickly prototyping "I'm on Observation Duty" style games, where players try to survive until the morning by surveying security cameras and reporting anomalies.

Completely written in commented blueprints and built with clarity in mind. Developers can easily build upon and create levels with flexible base classes.

A simple demo map populated with a few example anomalies is included, along with editor utility actions and a comprehensive debugging widget.

You can read a beginners friendly tutorial HERE.