Summary

It is often useful to break file links, for instance if you want to send a single file to another person. Before breaking a file link so as to bring the file back into your .3d file you must, however, ensure that the linked file has been called for by 3B2 and brought into your document, otherwise an empty header will be saved. You can use tlupdate to do this. Omitting the link_file and changing link_type to 0 breaks the file links: