After upgrade, global job scheduler would be disable. You can enable that either through UI or CLI.
3.1] Through UI
Login to the Dashboard and go to Admin -> Backups-Admin -> Settings tab and check the 'Job Scheduler Enabled' checkbox. By clicking the 'Change' button you can enable the Global Job Scheduler.
3.2] Through CLI
Login to the any WLM container, create and source the admin rc file.
Execute the enable the global job scheduler cli.
$ docker exec -itu root triliovault_wlm_api /bin/bash
$ source admin.rc
$ workloadmgr enable-global-job-scheduler
Global job scheduler is successfully enabled
4] Import old workloads existing on the Backup Target
Workload import allows to import Workloads existing on the Backup Target into the Trilio database.