Just a helpful tip which I just found out: I’m building portfolio pages. On every page there is a “lightbox photo gallery” which I build by adding 4 thumbnails in a 4 column row, then setting the interaction of each one to lightbox. Blocs adds a name for the gallery like “gallery-1”.
When previewing the gallery, the previous & next arrows weren’t cycling through the images quite right.
I found out that if I give each gallery a unique name (Mercedes, Audi, Porsche etc.) the previous / next arrows work fine. I my browser got confused because all galleries on all pages had the same name (Gallery-1)