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Quicken lets you have multiple cloud datasets for a Quicken ID created. This also means that you can associate multiple data files per Quicken ID. When you login to Quicken Mobile app, you would be shown all the datafiles/cloud accounts associated with the Quicken ID

Cloud Accounts in the preferences dialog shows your cloud account details like your cloud account name, last synce details etc
You can also set a friendly name to your cloud account by clicking 'Edit cloud account name'. The friendly name would help you identify the datafile when you login to other devices.

Cloud accounts associated with this Quicken ID

In case you have signed in with a particular Quicken ID across multiple datafiles, Clicking ' Cloud accounts associated with this Quicken ID' would show all the datafiles & Cloud accounts associated with a Quicken ID across all Quicken Products.