Good question Greg. I was forced from Picasa Web albums to google photos. The sites are of course set up quite differently. While Picasa let you set levels, like UTube, Public, limited, private, it seems GP has no setting I can find. You can share a photo or album using the "sideways V" function with various social media, email or just copy the link, or apparently create a shared album, (I have not done that) but it does not seem to be a public accessible site like some others. Maybe someone knows more.
And I can no longer post photos on the fly in chat, it just does not work. Too bad as I really enjoyed doing that. On my list to ask admin about that one.
Jerry