Deleting Photos on Hard Drive also deletes in iCloud
I need to free up space on my hard drive so I decided to move my Photo Library to iCloud. (I bought extra storage.) I have successfully moved the photos, but if I try to delete them from my hard drive they also get deleted from the iCloud. I don't get the message "is it OK to delete from hard drive" as some have stated in a previous post. I'm running High Sierra, if that means anything. Any suggestions? Thanks.
MacBook Pro 13″, macOS 10.13