Currently the Aha Release is associated to the GitHub Milestone when the issue is initially created.
Thereafter if the release or milestone are changed, the change is not reflected.
Release and Milestone should be kept in synch at all times.
See https://support.aha.io/hc/en-us/requests/91389 for additional discussion
This functionality is now possible with our latest enhanced integration with GitHub.com and GitHub Enterprise: https://blog.aha.io/enhanced-aha-integration-with-github-and-github-enterprise/.