You can access the Updates feed by tapping the new bell icon next to your profile avatar. 9to5Google reports that it redirects you to a new page that lists "recent sharing updates, including conversations and shared links." Google has made some changes since we first spotted the feature earlier this year. Instead of Sharing activity, the feed is now called Updates, and it's essentially a notification feed that lists user activity, including likes, new additions to albums, users joining shared albums, etc.