You can share photos and videos in Photos on iCloud.com as email attachments or an iCloud Link.
To share photos and videos using email
If you set up iCloud Mail, you can share photos and videos as attachments from your iCloud email. However, if the attachments are larger than 20 MB, they’re replaced with an iCloud Link.
° In Photos on iCloud.com, select the photos or videos you want to share. You can also double-click a single photo or video.
° Click the send button (a square with an arrow pointing out the top).
° Choose Email.
Share photos and videos with an iCloud Link
When you share photos and videos with an iCloud Link, anyone with the link can view them.
° In Photos on iCloud.com, select the photos or videos you want to share. You can also double-click a single photo or video.
° Click the send icon.
° Choose Copy Link.
You can share the link with friends using, for example, Messages or Mail.
Note that iCloud Links automatically expire after 30 days. You can stop sharing an iCloud Link sooner using iCloud.com on an iPhone or iPad.
(This how-to is based on my experiences and info on Apple’s support pages.)
