When used on platforms that provide the necessary support (such as ~TiddlyDesktop), you can optionally import binary files as external tiddlers that reference the original file via the ''_canonical_uri'' field.
By default, a relative path is used to reference the file. Optionally, you can specify that an absolute path is used instead. You can do this separately for "descendent" attachments -- files that are contained within the directory containing the wiki -- vs. "non-descendent" attachments.