No volume ID returned by volume snapshotter for persistent volume: azurefile-csi storage class for azure files

[virasana]

Error message: No volume ID returned by volume snapshotter for persistent volume

$>velero backup describe mybackup
...
Warnings:
  Velero:     <none>
  Cluster:   resource: /persistentvolumes name: /pvc-3cc9af3a-cc5f-4496-9aef-e916f27d8082 message: /No volume ID returned by volume snapshotter for persistent volume
  Namespaces: <none>

As indicated below, the storage class is azurefile-csi

$>kubectl get pv pvc-3cc9af3a-cc5f-4496-9aef-e916f27d8082
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                     STORAGECLASS    VOLUMEATTRIBUTESCLASS   REASON   AGE
pvc-3cc9af3a-cc5f-4496-9aef-e916f27d8082   4Gi        RWX            Delete           Bound    mynamespace/myapp-deploy-share   azurefile-csi   <unset>                          60d

Question: How do I handle azure files ?

Many Thanks!