I can't activate buttons that have the ability to open files, like open file, please help. How do you make the 'supports variables' thing work when connecting a companion?

[dsseo0216]

Hi I'm a fan of yours using your program so well in Korea

I'm really enjoying your program, thank you.

I have a few questions

How do you make the 'supports variables' thing work when connecting a companion?

I can't activate buttons that have the ability to open files, like open file, please help.