Hi Bob thanks for posting in the Lucidchart Community! You can integrate Diagram from your Lucidchart account using the Lucidchart Connector App. This useful article from our Help Center gives information on how to insert diagrams into Confluence pages.

If a document that is inserted into Confluence links to a different Lucidchart document this link will open that document in a separate tab in Lucidchart when clicked. If you would like the link to open the Confluence page I would recommend inserting all the documents into Confluence wherever you want them then grabbing the URLs from those Confluence pages and relinking the Lucidchart diagrams using the Link to Web shape action  to point to those pages. 

Let me know if this answers your questions!