⚠️ Due to recent shortcuts tweaks on Sketch 47, Zeplin's shortcut is now ⌃⌘E.
That's Command, Control, E!
If you still have issues exporting with the shortcut, make sure that you have Zeplin in Sketch’s “Plugins” menu. If not, learn how the plugin is installed.
If you already have the plugin installed, the shortcut might be conflicting with another plugin. You can always export manually through the “Plugins” menu: Plugins > Zeplin > Export Selected Artboards…