We work on a cloud server (Nasuni). There is a slight lag (up to a few minutes) when a user opens a file and the lock file is synced to the cloud server.

Occasionally, someone will be able to open a file that another user already has open. When that happens, in the document tab, the document shows as (read only). But there's nothing beyond that small text in the document tab to tell the user they are not working in a file they can save (and that someone else has the source document open).

What I would like to see is that when InDesign allows a user to open a read-only file, that they get a pop up window that informs them they are opening a read-only version, similar to the way that MS Office informs the user that the file is open elsewhere and asks them if they want to open a "read-only" version or cancel the document opening.