Only one brand displays for multiplacements

I clicked Add > Article in Mediaocean UK & Ireland, selected the placement, which was in Mediaocean UK & Ireland only, clicked Done, and then Save. Next, I clicked Manage sections to add more placements. But only Mediaocean UK & Ireland shows as an option. See screen shot. I don't know if this is by design. But I would expect to see all Zendesk regions (brands) to select where I want to add the additional placements.