Add code to your spawning volume so that it will only spawn when a boolean variable is true.
Check out the source here, with the project available for download: https://epicgames.box.com/BatteryCollectorSource
Variables, Timers, and Events: https://docs.unrealengine.com/latest/INT/Programming/Tutorials/VariablesTimersEvents/index.html
(00:05) - Recap
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