The default NetworkPolicies applied to the openshift-virtualization-os-images namespace prevent customers from uploading any images (ISO, raw disk images, QCOW2) into the shared / cluster-wide location.

4.20 

Reproducible via Web Console & CLI. Using the Web Console, click on Add Volume, then choose to place the ISO or disk image in the openshift-virtualization-os-images Namespace. If using the CLI, this virtctl command will timeout and fail because of the other/default NetworkPolicies.

virtctl image-upload -n openshift-virtualization-os-images \  pvc rubbish-test --size=6014152704 \  --storage-class ocs-storagecluster-ceph-rbd \  --datasource --default-preference windows.2k25.virtio \  --default-instancetype u1.medium --image-path "Windows 2025 Server EVAL.iso"

Web console will not show any progress and eventually timeout and fail.
CLI may show a few bytes transferred before it stalls, times out, and fails.

My customers and I believe that it should be allowed to upload into the shared openshift-virtualization-os-images namespace, or document that this is not supported.

Internal Slack conversation at https://redhat-internal.slack.com/archives/C068X44C8VB/p1770709767528439