Are there specific tile widths / ratios which need to be used when using dashboard tile images? Seen one post implying 4:3 but this doesn't make sense if you've got a solid background. See attached for example image. The uploaded image looks fine within PBI service - and the background properly shows as white - however when you publish an app to iOS containing the dashboard tile, the tile always shows with a small white border, with the background of the dashboard always grey. Note my dashboard background is white, and I've tried varying levels of opacity to get around this, without luck.