PureOS live ISO only supports MBR partition table and not GPT. Some EFI support motherboards do not detect MBR as boot partitions. Unable to force Rufus to use GPT for the live iso. Most Debian/arch/Ubuntu distributions I have on my GPT partitioned Ventoy multiboot USB work just fine except for PureOS which is a shame as a few of the people I have shared videos with would like to perhaps boot it up on their MacBook Pros but are unable to.
Please include the EFI directory and grub menu for a GPT UEFI install on the iso. Thanks
Keep fighting the good fight