Troubleshooting Flow Errors Using the Debug Button in Flow Builder | Salesforce Platform
As a developer you should test all customizations before rolling them out to users, and flows are no different.The Debug button on Flow Builder lets you fine-tune the flow’s behavior, identify, and fix bugs.It lets you enter values for the flow’s input variables and display debug details while running the flow.
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https://help.salesforce.com/articleVi...
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