Mi Wallpaper Carousel is the official app from Xiaomi for setting up a precious carousel of HD photos as your lock screen. This way, when you unlock your smartphone each day, you'll see a new photo.
From the Mi Wallpaper Carousel settings, you can change the frequency with which the lock screen photos change, whether it be every day or every two hours. You can also choose to download the wallpapers only when you're connected to WiFi.
From the options menu, you can select the photo categories that interest you most, and you can even create a folder of favorite wallpapers. Any photo you put in your favorites folder will show up more often.
Mi Wallpaper Carousel is an excellent customization app that displays new photos on your smartphone each time you unlock the screen.