users can now start a slideshow from any album. The across both the web and Android versions of Google Photos, allowing users to kick off a slideshow from any picture in any album on the fly.
To start a slideshow, just head to an album, select a picture and tap the overflow dropdown menu. From there, simply select slideshow and you're good to go. And for a big screen experience, you can even cast the slideshow to your TV.
If you're interested, you should be able to check out the slideshow feature on Android or the web right now.