In order to update the variable content, do the following: 

1. Create a Cinegy Titler scene.
2. Add a Text object.
3. Add a variable for this text object.
4. Change the type of this variable to "File", and in the "Value" column select the corresponding *.txt file.
5. Save the Titler scene.
6. When you have already added the Cinegy Titler template on-air, please, edit *.txt file and save it. This new value will be displayed during the playout.

Please find more information regarding variable updates in the "Updating Variables" section of the "Variables" chapter in the Cinegy Titler Manual - https://open.cinegy.com/products/titler/21.2/user-manual/variables/updating-variables/.