IMPORTANGE formula in spreadsheet

[Constantine]

I have already mentioned following information in your another topic:

SPREADSHEET FORMULAS

As I can see from other post, you are integrating Document Server with your own application. To use IMPORTRANGE in integration with your app you should rely on onRequestReferenceData method: For more information on external data please refer to this article:

@Alikhan

But I only have an editor in my frontend application and a test example

Do I understand that your frontend application does not have a storage or interface for files management?