Photos won't go to iCloud
I am trying to transfer my photos to iCloud because I only have 1.96 GB free on my Macbook Air, but I now have 200 GB of iCloud storage. The problem is that I supposedly don't even have enough space to transfer the full size photos to iCloud. I have the option to "Optimize Mac Storage" checked, but I am still getting an error which says, "This Mac is no longer updating because there is not enough space to store optimized versions of your photos and videos." This does not make sense to me. Shouldn't the optimized versions take up less space than the full size versions, so shouldn't it still be able to transfer the photos to iCloud and then only store the smaller versions on my Mac?
I am not sure how to resolve this issue. My Mac keeps on notifying me that I my storage is full, but it won't transfer my photos.
MacBook Air, OS X Yosemite (10.10.3)