From a Help file for CC Libraries in InDesign:
"•• Graphic assets in CC Libraries for which the creator app is not InDesign can only be placed as links or
embedded objects from the context menu of the graphic or when dragged onto the document are placed
as linked objects (Default behavior)
•• Graphic assets in CC Libraries for which the creator app is InDesign can only be placed as InDesign
snippets and not as a linked object
•• A placed graphic asset can be relinked to any asset from the CC Libraries with the option of Relink to CC
Libraries… from the context menu and the flyout menu in the Links Panel
•• A placed graphic asset can be relinked to any file locally with the option of Relink… from the context
menu and the flyout menu in the Links Panel
•• Linked assets can be highlighted in the CC Libraries panel, by selecting Reveal in CC Libraries by selecting
a link and opening the flyout or the context menu
•• The complete information for the Link created is shown in the Link Information Panel"
I don't have another computer to test this on at the moment since I'm traveling. But if you place a graphic asset into a CC Library panel, it is stored in that library. It is stored as an InDesign snippet but it also keeps a PDF file for non-InDesign application
If you open that library on another computer in InDesign, and you placed the same asset, it would place it as a snippet in a new InDesign file. It would be linked to the library.
If you are in Illustrator or Photoshop and you place the InDesign asset, it will be linked to the library, but it would use the PDF portion of the file since those applications don't understand the InDesign snippet format.
Steve has written a couple great articles about CC libraries in InDesignSecrets.com, they may shed some light:
and also (perhaps inspired by this thread):
It feels like just a few more features would make CC Libraries in InDesign really really useful!
PS Have you tried out the Collaborate or Share commands in CCL? Pretty neat