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I moved my Photos library to an external drive due to it's size. I removed ~/Pictures/Photos Library. When I launch Photos it asks to choose library. I select "Other Library" and traverse to external drive where I select the photo library I moved. Everything works as expected. I then choose Photos preferences and and select "Use as System Photo Library".

The next time I launch Photos it cannot find the library and I have to go through the above sequence again. I removed ~/Library/Prefernces/com.apple.Photos.plist and redid the procedure above. When I check com.apple.Photos.plist it has the path to the external library. Yet when I launch Photos it again says it can't find ~/Pictures/Photos Library.

Any recommendations what to try next?

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This might be simpler using EasyFind from the App Store [freeware]

A search [including invisibles] for apple.photos immediately after launching Photos holding Opt ⌥ , then quitting, shows several modified files, including

~/Library/Containers/com.apple.Photos/Data/Library/Saved Application State/com.apple.Photos.savedState
/private/var/folders/nc/c83zpk8x7kd9qrxrd3nnbfym0000gn/T/com.apple.Photos.librarychooserservice

It might be useful [after making sure you have a good backup] to test out some of those. SavedState is always a prime candidate for this type of thing, I'm less sure about the chooserservice, but it sounds apropos.

  • I renamed ~/Library/Containers/com.apple.Photos to ~/Library/Containers/com.apple.bPhoto. Then when I launch Photos it is pointing correctly to the external drive. In looking at the contents of com.apple.Photo there is a directory Data that contains links to ../../../../Pictures. My guess is this is what was causing issue. When launched Photos it did not create com.apple.Photos. This must not be needed as Photos is working fine. – DJL Jan 13 '17 at 19:44

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