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Click Update All Online Accounts at the top of the sidebar to download transactions and to sync to the Quicken Cloud. As part of the account update, the latest transactions entered or edited on the web or mobile device are downloaded to Quicken desktop.
Alternatively, if you don't want to download transactions but just want to sync your data to and from the Quicken Cloud, select Quicken > Accounts > Sync to Mobile or use the keyboard shortcut Control + S.