Hi ! I just saw the problem you had presented. I did some tests and the Global Variables works. I think you should look at the attached link and remake all the steps.
https://www.youtube.com/watch?v=0gkA1g42TSI&t=12s&ab_channel=coreBOS%3A%3AcoreBusinessOperatingSystem
https://www.youtube.com/watch?v=0gkA1g42TSI&t=12s&ab_channel=coreBOS%3A%3AcoreBusinessOperatingSystem