By default, and using the Connect tab, you can read data from current site content, and also from all other sites in the same site collection.

Current site: read all lists and libraries from the current site

Other sites: read all lists and libraries from all sites under the same site collection

How to read data from another site collection?

1. Create new connection type
2. Use SharePoint REST/OData query to read data from any list in the farm
3. Save the new connection
4. Consume the new connection type in the connection tab
5. Very simple :)

Step 1. Open Connection Manager

Site Settings > ShortPoint Dashboard > ShortPoint Connections:

Step 2. Create new connection

I want to connect with FAQ SharePoint list stored in an external site collection.

Name: FAQ

URL: 

http://<domain>/<site url>/_api/lists/getbytitle('FAQ')/items?$select=Title,Answer

Press Save Changes

Notes:

• Make sure to add https of you are using SharePoint online
• The test will not work on the connection manager page
• getbytitle('LIST_NAME'): will point to the exact list. In our example, it will reference FAQ list
• The left part of the query is used to select the site and site collection
• /items: will tell the query to return list items
• $select=Title,Answer: Will tell the query to return these two columns only. Otherwise, you will have a list of so many columns