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If there has been an unsuccessful change, the app will try again to automatically sync if the auto-sync setting is on. Otherwise, the user will have to click Sync Now manually. If there are local changes pending because of an interrupted sync, the app will continue to store all changes to the local database only until the next successful sync. This is to preserve the order of record operations and to make sure the dependencies are resolved before pushing changes to Salesforce. These changes will then be pushed to the server upon next sync. Upon next successful sync, the online status indicator will turn green.
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