HI!
When posting an ITS together with testrun data I always put the ITS number in the archive's file name but I don't know the number before submitting the ITS. Therefore I wait until the generated ITS message to be received and then follow up with the URL to the testrun data. Would be much better if attachments (or at least URLs) could added to an issue after submission (like in Bugzilla) to avoid URL references to external resources.
Ciao, Michael.