When setup Centrestack with multiple worker nodes, preview file on web portal will hit error 'Document cache info is not found'
This is because the file preview is generated on one node and other nodes can't visit it.
To fix the issue, as cluster admin, edit the default tenant (My Tenant).
Here, go to Settings, Clients & Applications, Default Document Viewer.
Need to define the cache to use a location where all worker nodes can access. It can be a common file share, or a cloud storage like a S3 bucket.