Use the Subscription Settings page of the Reporting Services Configuration Manager to configure a file share account for Native mode report servers and file share subscriptions. The file share account allows you to use a single set of credentials in multiple subscriptions that deliver reports to a file share. When it is time to change the credentials, you configure the change for the file share account and you do not need to update each individual subscription.
Reporting Services Configuration Manager:

Reporting Services Subscription:

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