An attached .dgn file is not displayed when attaching. In the image you have San Miguel. Dgn where Pueblo Libre.dgn is attached. No Free People is displayed. When doing the inverse test, attached San Miguel in Pueblo Libre, both files are observed. Please your support.
Yes, the reference files will be in red if the current directory structure is different than when the file was reference attached...and you can detach and re-attach the file to correct the directory path, or as you mention, refresh the path and the reference files will be visible. Thanks for your update and reply.