Ok, I feel embarrassed that I wasn\'t able to figure this out on my own, but after a few wasted hours, I figured it would be easier to simply ask over here:
I have a bun
It can do.
and Corey is right, files is not class.
Please see below code:
https://script.google.com/d/1QcyrlnwWGdMnJNxJ2X4qfGeM1q75YxJopPuNKUDgOjmqsp4dilLYtC-A/edit
Files aren't classes. You can call any functions in any file from any other file. Think of your files as if they were just added together before running. If you want class-like scoping you can use the Libraries feature.
The following syntax allows you to call any function from within your Google Apps Script project, regardless of whether the function is defined in the same file that is calling it:
myFunction();
The following code is unnecessary and will throw errors:
google.script.run.myFunction();