too bad to be so expensive
First of all, we are sorry for your frustration using our products. We do our best to bring smooth and convenient UX in our products, which is praised by many other user’s review. However, in some cases like yours, the image pre-processing by human (yourself) is required, because there is no way software can understand which part of the image you can to show on the slideshow. It’s even more tricky, when it comes to the case when you want to show vertical oriented image in horizontal oriented gallery.