I have uploaded documents using file upload as “In Content Document (with Record Context)” with a parent model of “CR_File_DNA__c”.  How do I view the files attached to a CR_File_DNA__c record?  It looks like there is a field “ContentDocumentId” in the “ContentDocumentLink” that creates a relationship with the field “ContentDocument”.   
This documentation: https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_contentdocumentlin…
is not clear.  What field links back to my “CR_File_DNA__c object” ?