When you export to the “Flat OpenDocument” format, the images are not actually included in the file. Rather, they are “linked” to in much the same way that an HTML document links to images rather than including them directly.
If you wish to share your document with others, you can share the images as well (keeping everything in the same relative locations as on your machine).
A better option, is to use the “Edit:Links:Break Link” menu item, to embed each image as desired in the document itself. Then you can share the document without worrying about separate image files.[an error occurred while processing this directive]