You must confirm that the ISO file itself support UEFI boot.
You can use a VirtualMachine(e.g. Vmware/VirtualBox) to test.
Set the VM to UEFI mode and just connect the ISO file directly to the VM and boot.
If it can't boot in UEFI mode, that means the ISO file itself doesn't support uefi mode. In this case, Ventoy can't do anything.
You can use a VirtualMachine(e.g. Vmware/VirtualBox) to test.
Set the VM to UEFI mode and just connect the ISO file directly to the VM and boot.
If it can't boot in UEFI mode, that means the ISO file itself doesn't support uefi mode. In this case, Ventoy can't do anything.