Select a song or soundtrack from your music library, then click OK.
Apple Music subscribers can click Browse to search for songs in the Apple Music library.
Use Memory looks to apply consistent color and style adjustments to all the photos in a memory.
Go to the Photos app on your Mac.
Click Memories in the sidebar, then double-click a memory.
To stop playing a memory, press the Space bar.
Click on your Mac.
Scroll through the memory, then pause it when the photo you want as the key photo appears.
You must pause the memory to choose a key photo.
Click , Photos settings on Mac