Committing data is VAN's term for taking canvass results from MiniVAN and pushing them into your VAN committee. Until data is committed, it won't be visible in Contact History or elsewhere. Uncommitted data disappears after 21 days, so please be sure to check daily that your data is being committed.
To commit data, navigate to MiniVAN Commit. There, you can audit the canvass data to ensure everything looks correct, then check the boxes for each list you'd like to commit and select Commit Data.