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When a file is uploaded to the Fusion Team Hub as a new version, the new version does not get download to Vault. As a result, even though that Vault is 100% synced with the cloud the version of a specific file can be 3 in Fusion Team Hub and 1 in Vault.
I have moved your Idea post to the forum for further discussion.
if you are using Project Sync, the files should get downloaded from Fusion into Vault when there is a change to the file in Fusion. This should happen if you have the mapping configured to bi-directional.