Auto wallpaper changer I need to auto download wallpaper from internet and set based on a frequency ( daily or hourly ) ?
I'm using Samsung Galaxy Note 8 on Android Pie. Is this functionality available in android?
You can try Casualis:Auto wallpaper change. It can:


  lets you have an always new wallpaper without lifting a finger: you just have to decide when you want Casualis to activate and you're done!
  
  Features:
  
  
  Set a random wallpaper every 1/3/6/12 hours or every 1/3/7 days, at the time you prefer;
  Choose a wallpaper manually among over 3000 high-resolution images or use your own images;
  


In the settings, you can select the wallpapers from. Disadvantage: It shows ads.

Or you can try Wallpapers.


  
  Enjoy a collection that keeps on growing. Access images from Google Earth, Google+, and other partners.
  Double your fun. Show the world one wallpaper on your lock screen, and keep one for yourself on your home screen. (Requires Android™ 7.0, Nougat, and above.) 
  Start each day fresh. Pick your favorite category and you’ll get a new wallpaper image each day.
  


Disadvantage: Made by Google and not updated since 2018.