I am setting up my home Macs, both High Sierra, (a 5'1 flashed late '09 Mac Pro with a 256 GB SSD and a late '16 MacBook Pro with 512GB SSD) to work together for my photography. I figure I can spare 50GB on both drives for working files which should be immediately accessible from both Macs. Can I set them up with optimized storage on the same iCloud account? Will both Macs share all folders on iCloud? This is what I want; ideally both would sync with iCloud so all files would be accessible from either Mac and the latest version always accessed from wherever I opened it. Is this doable?