Suggest to add instructions that absolute path need to be used in environment or template file if the location is no longer in the original /usr/share/ locations as it will fail if "../../docker/services/ceph-ansible/ceph-mon.yaml is specified https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/fast_forward_upgrades/assembly-preparing_for_overcloud_upgrade#annotations:15600033-69aa-4bdb-8b15-8668f195a2d1
Add an admonition regarding absolute paths required if using a custom environment file.