Thanks for the input.
If I export as in the video, wouldn't I get 3 separate files?
If I want to export the "right", "central" and "left" into a single "slice.png", how do I go about it ? One way that I got to know from another video on the channel suggests grouping these three items into a group (or an artboard or a layer) and then export that single layer/group/artboard.
I would ideally like to be able to select items/objects from multiple layers without resorting to grouping them (because they items are already structured to various layers).
Something like: group slices into a single slice/file for export?