Hi Lorraine.

I think the issue is that the Constraint is not set for the condition to be able to reference the filename. I see that you have added a comment to another post which explains how to do this, but it stops short in explaining fully. Fortunately, Joshua Goldman then links to another post where he goes in to more detail.

I'll copy and paste it here, and include the link.

https://community.intersystems.com/post/how-route-file-based-file-type

1.  Define a business rule. Make it a General Message Routing Rule and have the assist class be EnsLib.MsgRouter.RuleAssist.
2. Add a rule to the rule set and double-click Constraint. Specify the rule class Persistent > ENS > StreamContainer
   That's the message class used by the pass-through file service/operation. You can also specify the business service as the source.
3. Double-click  condition, and in the expression editor specify Document.Type or Document.OriginalFilename, add an operation, and a  value.
4. Send it to the correct operation.
5. Define a router business process and specify the rule you just created.
6. Connect the pass-through file service to the router.