Customer should be able to click on button "View raw file" and download files from the Web UI when ACL is enabled. Instead "Permission denied" message pops out even with management token.
This is known issue that is fixed in version v1.0.0.
Check your nomad version:
If it is prior to v1.0.0, please consider an update.
Github issue: https://github.com/hashicorp/nomad/issues/9022