Why did only half my photos migrate to new Photo app?

[iMore Question]

After installing latest update, my iPhoto file seemed to migrate to the new Photos, but turns out the last 3 years did not move and are still in the old iPhoto app. Can't seem to migrate the rest. Can you help please. Thanks.

 

[kch50428]

Re: Why did only half my photos migrate to new Photo app

Photos for OS X | iMore