MACROMEDIA FLASH MX 2004-USING FLASH Use Manual page 73

Only identical library item types may be replaced with each other. That is, you cannot replace a
sound named Test with a bitmap named Test. In such cases, the new items are added to the
library with the word Copy appended to the name.
Note: Replacing library items using this method is not undoable. Be sure to save a backup of your
FLA file before performing complex paste operations that are resolved by replacing conflicting
library items.
If the Resolve Library Conflict dialog box appears when you are importing or copying library
assets into a document, you can resolve the naming conflict.
To resolve naming conflicts between library assets, do one of the following:
•
Click Don't Replace Existing Items to preserve the existing assets in the destination document.
•
Click Replace Existing Items to replace the existing assets and their instances with the new
items of the same name.
Resolving conflicts between library assets 73