There are many times when more than one person is working on a project. When this happens it is very difficult to keep the changes in sync. What we’ve been doing is exporting the project to a .zip, sending to the user, they create a new project and import the new .zip. Very complicated when there is only one mockup to change. If the user imports the project in an existing project it simple creates 2x the files, even though they have the same name.
It would be nice if files of the same name were replaced by the imported files. This way it would be a simple export/import to keep the projects in sync.