"When invoking the 'Save' command, KeePass checks whether the file on disk/server has been modified while you were editing it. If it has been modified, KeePass prompts whether you want to overwrite or synchronize with the file."
https://keepass.info/help/v2/sync.html
KeePassXC, on the other hand, does not seem to have been designed for shared synchronization:
"Cloud synchronization ... can be easily accomplished by simply storing your KeePassXC database inside your shared cloud folder and letting your desktop synchronization client do the rest. We prefer this approach, because it is simple, not tied to a specific cloud provider and keeps the complexity of our code low."
