A force-offline override routes every read to the cache and every write to the queue; preparing for offline downloads trip data, documents and map tiles up front and waits for them to finish. Map tiles and individual trips can be left out of the cache. Queued edits carry the version they were based on so the queue can surface server conflicts for a keep-mine / keep-theirs decision; chained offline edits to one entity no longer conflict with each other, and evicting a trip preserves its unsynced writes.
Maurice