It can be a little easier or a little more complicated if you use iCloud Photos. On the new Mac, hold down the Option key while launching Photos and you can select the library you copied over. If you’re migrating from one Mac to another-or just want to move your Photos library from one to another-you can simply copy the file. It also makes the Photos library and similar libraries and app-associated file packages easier to move. This prevents us from accidentally moving items out of it, renaming files that need to have fixed names, or modifying documents that shouldn’t be touched. The Photos library used in macOS acts like a file when it’s actually a package, a special macOS container for holding many objects together.
