A virtual machine snapshot with memory from a previous cluster version can now be previewed. The virtual machine's custom compatibility version will be temporarily set to the previous cluster version. The custom compatibility version is reverted by undoing the preview, or via a cold reboot (shut down and restart).
We should only remove info if exists on this limitation. If there is no info on that, we should not add any info now.
Assigning to Byron for review. Byron, see Yaniv's suggestion in comment 1, and please close the bug if such a limitation was never mentioned in the docs.
Reassigning to Avital as Byron is focusing on upgrade content. Avital, instructions are in comment 1 and comment 2, and you may find that there is nothing to do here. If that's the case, please close this as WONTFIX.
Updated document: https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.1/html-single/virtual_machine_management_guide/