I wonder if this is why. I just wish we could tell it “ok, I got a new phone, but I don’t want the full size of all these photos - please optimize the storage of photos now!” Hahais it possible the process is to first download the whole collection to the device but then remove it as it goes through the space optimization??.....my photo collection now taking 120gb on my 13 pro max...I have a tonne of videos but those were in icloud before...I feel like they've been downloaded to the device...