When you transfer a document between a local and remote folder using the Files panel, Dreamweaver gives you the option of transferring the documents dependent files. Dependent files are images, external style sheets, and other files referenced in your document that a browser loads when it loads the document.
Dreamweaver also treats library items as dependent files. For more information, see About library items.
Some servers will report errors when putting library items. However, you can cloak these files to prevent them from being transferred. For instructions, see Cloaking folders and files in your site.