External references are not part of the drawing. Rather, they are links to an externally referenced file. To provide a copy of a drawing containing external references to someone else, you must also provide all the external reference files. In addition, the person receiving the drawings must either re-create the same paths you used when linking the external references or change the paths for the external references.
The Insert command in the External Reference feature lets you insert an externally referenced drawing as a block. To provide a copy of a drawing that contains an external reference, it is best to insert the external reference as a block.
Advanced experience level
To provide a copy of a drawing that contains external references, it is often easier to first bind the external references to the drawing. Binding the external references makes them a permanent part of the drawing, which is the same as inserting a separate drawing as a block.
Advanced experience level
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Changing the path for external references