Photos and iCloud

I use an iMac with a 121 Gb SSD drive that is my system disk, and a larger conventional drive (3 Tb).

To regain space on my C-drive C:/, I moved the Photo library to the D-drive D:/ and designated it in its new location as the “System Photo Folder." The library in its new location seems to work well and iCloud is updating.

However, I haven’t recovered any space on the C-drive. It should be about 40 Gb in freed space. Under "Manage Storage," the system showed the old Photo library and allowed me to delete it. However, Finder does not show any regained space.

I cannot locate the file or files that are using this space.