How do I get Unreal to dynamically change based on what a text file says?

Right now what I have unreal do is write to a text file and read it. I have a Boolean variable writing to a text file true or false. The image below is the blueprint script that allows Unreal to read that text file (I am using Rama’s Victory BP library plugin). So how do I get unreal to either change the variable base on the text file or do something (like pause the game) if there is a/any change in that text file?

The effect I am trying to get with this is when a USB device is unplugged it gives the user an error and when that error is fixed the app runs like normal.

Any and all help is greatly appreciated!