问题:

The subject of the question says it all.

Where do I find the 'code-behind' or 'resource', or whatever it's referred to as, which is generated when I use the GAS Gui builder.

回答1:

You can access the UI built using the GUI builder only by using the GUI builder. The code behind it, if generated, is not exposed.

回答2:

The code or whatever describes a gui must be stored in the project file (For which up to today there is no way to access its contents either).
You can open/access the different gui-components from within gui-builder, but only those created inside the actual project (That's why I think its stored in the project file).

回答3:

GUI components are stored with the script but currently hidden because they are stored in a proprietary model format to make them easily editable in the builder, and not stored as raw code. We should probably give you a way to see the code that gets generated at runtime, but making it editable would be very challenging since not all edits to the code would result in a valid model. But open an issue; we can definitely look into it.

Scripts not downloading in drive is something we are aware of; no promises but it's a known issue.