Open shared content
Only InCopy users can open assignment files (.inca). If an InCopy user opens an InDesign file that contains assignments, the user will have access to all the managed content, regardless of assignments.
Do one of the following.-
In InCopy, choose File > Open, select an assignment file (.inca), and click Open.
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In InDesign or InCopy, choose File > Open, select an InDesign file (.indd) that contains assigned content, and click Open.
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Open an assignment package. See Receive packages (InCopy).
The assignment names and their contents appear in the Assignments panel.