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That is why I recommend to start with the smaller library. The merge will not include the Faces albums and projects from the first library you uploaded. The merged library will sync back to your larger Photos Library. This library will be merged into the library in iCloud too, creating a merged library in iCloud. Photos will merge the the library into the library that is already in iCloud.Now enable the larger library as your iCloud Photo Library. To merge in iCloud enable the smaller of the two libraries as your iCloud Photo Library.Wait for all photos to upload that can take a very long time, a week ore more, depending on the size of the library. My library with 40000 photos took a full week to upload. It is the best way to migrate libraries you invested much work into, but uploading large libraries to iCloud requires a paid subscription for more storage than the free 5GB - for at least a month, and it is slow. Photos will scan for duplicates while merging. The searchable faces names will upload (only on Photos 1.5 or older, not on Photos 2.0), but not the faces thumbnails and albums. All edited images will be paired with their originals, so you can undo the edits and revert to the original. Your albums and folders will migrate, keywords, titles, and other metadata. The options in Photos are: Merge the libraries in iCloud by uploading them to the same iCloud Photo Library: Merging in iCloud is the only way to preserve the master-version pairs, so you can revert edited photos to the original versions.
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#Combine all my photo libraries how to
If you are planning to migrate your photo libraries from Aperture or iPhoto to Photos and own Aperture 3.6, merge your libraries in Aperture before the migration while you still can use Aperture as described here: Aperture 3.3: How to use Aperture to merge iPhoto libraries - Apple SupportMake backup copies of the libraries before you try that.