new attribute doesn't appear in work item editor

I'm trying to add a new attribute to a Story work item. From what I read in the documentation, I think I have done everything, but the attribute does not appear when I view/edit a story. Please point out any missed steps, or provide advice on how to troubleshoot this. Here is what I did:

- added a new Enumeration called "storyType" with 3 literals, no default, no unassigned
- in "Types and Attributes", selected the "Story" Type Category, and added a Custom Attribute named "Story Type" of Type "storyType".
- in "Editor Presentation Bindings" verified that a Story work item editor is named "com.ibm.team.apt.editor.story"
- in "Editor Presentations" choose "com.ibm.team.apt.editor.story", and in Overview -> Details added a new Attribute-based Presentation of Attribute "Story Type" and Kind "Enumeration" before "Filed Against"
- saved the Project Area document
- open up an existing Story or create a new Story. The attribute is not appearing.

Any suggestions? Thanks in advance!