Promoted build action to copy files into a releases folder using this path:

/u0/releases/Server/${BRANCH}/QA/${PROMOTED_NUMBER}

works fine in 2.15, promotion log shows:

[SCP] uploading file: '/home/jenkins/releases/Server/develop/QA/397/CHANGES'
[SCP] uploading file: '/home/jenkins/releases/Server/develop/QA/397/Packages.gz'

and fails to replace the ${BRANCH} env token when using 2.17:

[SCP] uploading file: '/home/jenkins/releases/Server/${BRANCH}/QA/390/CHANGES'
[SCP] uploading file: '/home/jenkins/releases/Server/${BRANCH}/QA/390/Packages.gz'

Note that ${BRANCH} is not being replaced by "develop"