InCopy Error Message and "No InCopy Stories"

I am working with a freelance graphic designer in another state on a magazine project. She works in InDesign and prepares InCopy .icma files for me, which she shares via Dropbox. I am an editor working in Incopy (on a MacBook Pro, running Sonoma 14.5). I received this error message: "Because this document contains no InCopy stories, Gallery View and Story View are not available." When opening the .icma file, it opens to two blank pages (a spread) and oddly shows the project footer text but nothing else.

This file previously opened and worked fine. Other .icma files from the designer continue to work fine.

The graphic designer says she can open the problem file without difficulty on her end. What is likely the problem and how can it be easily fixed?