Users upload the file in the opportunity or Lead in the SharePoint path. Based on the Security permission defined in the Dynamics 365 should be updated,Here I am facing the Problem is Only own Business unit Team members can access the file while they are accessing by dynamics 365 portal, but the same users go to the SharePoint parent path (Account/Lead/Opportunity), they will see all the files from the other business unit. It's the big hole in the Security end.