Is Product Slider+ an image slider?
Product Slider+ was designed to showcase your products in a slider fashion but it is not possible to display other items. Particularly, it is not possible to upload images to the app.
On our demo at http://antique-cars.myshopify.com/, you will see Product Slider+ showcasing the products in the store. You can click on the product image to go to the product page so it can be considered a sales app more than just a slider.