Hi,
I haven't tested it with NFSv4 on Linux, but I couldn't find any mentioned versions in the Cisco docs either.
Maybe you just have to test.
But the most important thing is, that you enable anonymous access, since you can't work with authentication on CMS side for NFS.
Don't know if this link helps: https://www.cisco.com/c/en/us/support/docs/conferencing/meeting-server/214691-configure-nfs-share-to-use-as-storage-fo.html#anc9
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