turn photo album into shared album
I have many albums I have to change Into shared albums
MacBook Pro 16″, macOS 15.1
Question marked as
To turn your albums into Shared albums you have to create a new Shared album for each of the album, then select the photos on the album and use the Share menu to add the photos to the shared album.
But keep the original albums, as the shared items in the shared albums will be special copies just for sharing, in a reduced size and sensitive metadata will be stripped, the titles, captions, locations, and the dates may be wrong.
How to use Shared Albums in Photos on your iPhone, iPad, and Mac - Apple Support
iCloud: My Photo Stream and iCloud Photo Sharing limits