Access Denied when deploying custom in WebUI

I have a non-MO account that has access to the “Custom” app in WebUI (globally allowed permission). When they try to deploy a piece of custom content to target endpoints, they get an Access Denied error.
From the Apps dropdown at the top of the WebUI window, they do have the Custom option in the dropwdown. Running v10.0.2.52.
Any suggestions?

Issue resolved by granting the “Workflow” WebUI app permission .

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