in Sketch, when you select an exportable artboard you get a little preview in your inspector panel. Dragging this preview out gives lets you export it, however for some reason Sketch tries to export some of my artboards as pdf instead of png. It also wont let me drag it onto my desktop of anywhere else.
I guess this is some sort of setting you can do per artboard, but I cannot find where to change this behaviour. If you could point me in the right direction I would be very grateful. Thanks