I just enabled IPL on my Mac. It's uploading and all that. The one thing that isn't clear from Apple is, can/should I enable it on my iPhone right now, with my Mac currently uploading my photos? Or should I wait? Not really clear on how it syncs both devices if there are photos that are not on one but are on the other. I am also assuming that if each device has a duplicate, it doesn't include that in the upload? See my minor confusion? Thanks for any input!