I am thinking of deleting my iCloud Photo Library from my mac as I encountered a terrible bug. I turned off my iCPL to try to fix another issue (I'm telling you, it's a mess) and when I turned it back on a minute afterward, it wanted to re-upload ALL 40 GBs. It's been taking 7 hours so I made it stop. It is much faster to download them all BUT I do not want to lose the original full on resolutions from my Mac that I've been transferring for years.