Import keyword can be used to provide assets to the current project which are not stored in the project data directory. See the resource paths documentation for the definition of the project data directory and how to load resources.
However, if you need access to a file that is not in the data directory, you can tell Cerberus X to include that file in your build and make it visible and accessible for data loading by 'importing' it with it's relative file path. For example:
' makes assets/myfile.png accessible
' loads the file