It would be ideal if Zeplin knew how many screens were ACTUALLY updated. To save time, I export all my artboards from a sketch page to zeplin. I highlight shift+cmnd+A every artboard on a page and just export... this makes it easier to make sure hotspots are correct and faster then individually selecting boards. Often this confuses devs. So if the slack plugin mentioned the actual number of changed artboards, it would not freak out devs when they see a slack message saying "50 screens updated".