I have switched to Photos on my iMac - OS/X 10.10.3 beta (already done so on my phone and pad) and am currently trying to find my marks in the app. My iPhoto library of some 11000 pictures, about 33Gb, has been uploaded and is migrating to my iPhone and iPad currently, eating up the storage... I turned on 'Optimize iPhone Storage' to save space on the phone but I wonder if the FULL version will still be downloaded when I edit a picture?? As well, what happens to pics I take on the phone? Smaller version remaining on the phone and full version uploaded or what. This is not yet clear to me and I would appreciate some further explanations.