When
you add a library item to a page, the actual content is inserted
in the document along with a reference to the library item.
Place the insertion point in the Document window.
In the Assets panel, select the Library category .
Do one of the following:
Drag a library item from the Assets panel
to the Document window.
To insert the contents
of a library item without including a reference to the item in the
document, press Control (Windows) or Option (Macintosh) while dragging
an item out of the Assets panel. If you insert an item this way,
you can edit the item in the document, but the document won’t be
updated when you update pages that use that library item.