5:44 PM PST
Thank you so much for your patience as we worked on this. We've just released a fix. You will be able to use Workflow Builder from the channel's actions menu after a refresh (Ctrl/Command + R).
3:14 PM PST
We are aware of issues using Workflow Builder from the channel’s actions menu. We apologize if your workspace is affected. We are working to resolve this, and we'll keep you posted.
2:13 PM PST