The “k3s” and other “Apps”-related datasets might not be as straight forward to copy, due to the likely granular permissions, ownerships, and ACLs.
Can you test the above steps, but with a standard “file storage” dataset?
Keep in mind that your user/UID in your Linux machine is likely to be different than the users and owners of files and folders on your TrueNAS system.
Paging @kris @HoneyBadger @ericloewe and @joeschmuck and any other mods that might be online.
It’s too hard to do this when the user cannot reply in their own thread.