Hi David,
I am sorry to hear that your experience with Nutanix has been frustrating.
There is no Mount ISO granular permission but the Edit Access pre-configured level should do the trick. Alternatively, for granular control, you’d use Access Console VM, Clone VM, Update VM, Update VM Boot Config, Update VM CPU, Update VM Categories, Update VM Disk List, Update VM GPU List, Update VM Memory, Update VM NIC List, Update VM Owner, Update VM Power State, Update VM Project, View Cluster, View Subnet, View VM,
I took those from the Security Guide: Custom Role Management.
Is that what you were looking for?