Drawings are gone when student opens project after compressing & moving it from one computer to another

This has happened to multiple students maybe ten times already in the first four weeks of school. They have opened a project that has been ZIPped to transport from one computer to another to find only blank frames on the timeline with no drawings. It is common enough that others must be experiencing this and/or it seems like a serious problem that Toon Boom should address.

Is it that the program isn’t looking in the correct directory for the drawing files after being loaded to a new drive and uncompressed? Can it be fixed or can we fix it somehow? Does anyone here have advice on how to re-link drawings to the timeline?

Isn’t there anyone from Toon Boom who can respond to this? Is this just an unmonitored user forum?