I’m glad to hear it worked 
Just one note: Manage env vars should also work if that step is in that workflow.
The UI is not clear, will be fixed in the upcoming new Workflow Editor (Workflow Editor “v2” (Open Source & Offline Workflow Editor)). Manage Env Vars right now sets env vars for only the selected workflow. Those env vars won’t be available in other workflows (unless chained as an after workflow), App Env Vars are exposed for all workflows (related docs: http://devcenter.bitrise.io/bitrise-cli/most-important-concepts/#availability-order-of-environment-variables).