Can I share an item with people who aren't signed in?
đź”´ StageStock
No. Anyone viewing an item has to be signed in to your StageStock site, whatever the item's visibility is set to.
Shared Publicly is a choice in an item's Visibility field, but today it works exactly like Internal: people whose role in the item's category includes View Items can see it, and nobody else. Shared Privately works the same way. Only Restricted changes who sees an item, limiting it to people whose role includes View Restricted Items.
All four options, explained: Choose an item's visibility