Add photos to your portfolio
Open Menu, then WEBSITE, then My website, and find the Portfolio card. It says "These photos fill the Gallery block on your site", which is the bit people used to have to guess at.
Choose photos picks which of your photos are live on the site. Upload, caption and delete takes you to the full portfolio screen, which is where photos actually get added and captioned.
Add a photo, then give it a Caption, something like a client name and the light you shot in. Photos are grouped into categories, and you can reorder them.
This is separate from client galleries. Portfolio is what strangers see on your public site. A gallery is what one client sees of their own photos.
On a team, "Viewing only. The owner manages your team's portfolio" means exactly what it says.