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I was very timid to check out the new Photos.app, and therefore decided to just start a fresh library and have it sync what my phone had through iCloud Photo Library.

After checking it out for a bit, I think I want to move forward entirely with Photos. But at this point, I don't know how I can add in my Aperture library without opening it as a different library (holding down Option), but then don't know how it handles the current iCloud Photo Library.

I checked the menus, and import only preps you for importing photos, not another library. I can open my other libraries, but worried about what that will do with iCloud Photo Library. Do I just need to export everything? Do I open the other library and let it sync?

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There is no way to import an Aperture/iPhoto library except start a new Photos library and have it convert from an existing Aperture/iPhoto library.

I think the best solution would be to start a new Photos library based on your existing Aperture library. Attach your iPhone to the Mac and wait for it to appear in the sidebar in Photos, then import everything it will let you from the phone. Finally, set it as the system library (Photos menu > Preferences > General tab > "Use as System Photo Library") and enable iCloud Photo Library (Photos menu > Preferences > iCloud > iCloud Photo Library).

In theory this should cause the images from your new combined Photos library (old Aperture library + what was on the phone) to upload to iCloud, while also downloading anything in iCloud that does not exist in your new Photos library. And in turn, your phone should download anything new that is uploaded to iCloud.

The step of syncing from your phone directly to the Mac should not be necessary, but is a backup just in case iCloud freaks out with the change in the System Photo Library and removes what you uploaded from your phone. It also saves Photos from having to download any of those photos, assuming it finds them to be duplicates of what's in iCloud.

  • This is what I did and it worked great! I thought through how I wanted to do this some (was about to export everything as images from Aperture to have a fresh library), but glad I did not. I didn't think about cleaning Aperture up a bit more though, so took a while to clean up in photos. – jmlumpkin Apr 19 '15 at 23:50

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