IBM Connections Desktop Plug-in provides the option to lock a file. However, users have to lock a file manually before editing, and forget it most likely. A first improvement would be to prompt for lock before editing a file. Confirming this prompt would ensure that a file gets locked and cannot be edited by another person in parallel.
Idea #I-48 (https://connections.ideas.aha.io/ideas/IDEACNCTNS-I-48) describes a more broader approach including a check if a file is currently being edited by another person in IBM Docs.