Photos migrate library to iCloud

Thanks, yes I did misunderstand Photos iCloud concept. I think what mislead me was that one can buy 2TB of storage data, if it is just used as a device distribution cache why would you have one that is bigger than any device can have ? The reality is that it is also a storage point, so the originals can in fact be stored there but smaller versions can be kept in the devices. Besides that the iCloud is also used for backups of devices, and other things, and if you have a family and many computers, devices then it adds up and makes sense I guess. The ability to share content is also a key point.

Thanks.

You are right, it has to be used as System Photo Library. However, I misunderstood how the iCloud worked, and because of that I did not understood the idea of having a System Photo Library on my laptop when it should be in the iCloud... naturally I was wrong so I was going down the rabbit hole.

Once I got the iCloud concept cleared out then this button made sense and now I just turned my existing library into the System Photo Library, no need to export, import, merge, etc. that I was trying.

Thanks!