How do I share an entire album in iCloud photos? Not just individual pictures
Unfortunately, Shared Albums are not currently available on the web:
Can I view shared photo albums on the icloud.com web interface?



You cannot share albums created on your iPhone or Mac or on iCloud Photos with other iCloud users.

These albums are synced to your other devices via iCloud, which is why you can see them on the web.

In the image you are attempting to share a normal album. These cannot be shared.

You must use the dedicated "Shared Albums" feature of iCloud Photos. This is different than the "Albums" feature, which you cannot share.

Shared Albums are not available via the web interface.