Does any one know whether it is possible to select only part of a jpeg to create an interaction when prototyping a wire frame? At the moment I can only select the whole image.
The simplest way to do this today is to create a separate object overlaid on top of the image and use that as a "hotspot" that you attach the interaction trigger to. You can set the opacity to 0 so it has no visual appearance but can still be selected and clicked.
If you'd like a more official way to do that, please upvote this suggestion on our feature-request list: Create separate, custom hotspot areas – Adobe XD UserVoice.