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Was out of the country for a while, returned to my computer and opened Photos (MacBook Air running High Sierra 10.13.3). All of my photos from a previous old Mac are gone. Held down Option while opening Photos and two libraries appear, one of which has ALL the old photos. Tried to export to an external hard-drive, wouldn't work. How do I migrate them into the current version of Photos? It includes all my albums, or "Events". Thank you!
MacBook Air, iOS 10.3.3
Not clear what you want
If you have multiple Photos libraries this discusses the options for merging them - Notes on Merging Photos Libraries - with using iCloud Photo Library being the only one that is close to a true merge
LN
Old photos disappeared
