Android version!

I've been looking for ways to keep a digital sketchbook for ages before I found your Skillshare class, because I sketch in my tablet more than I do traditionally and I wanted to find a way to keep my digital sketches in a meaningful way. Awesome class, learned a lot!
I made some adjustments since I have a Samsung tablet, so this is made using Samsung Notes, Clip Studio Paint and the Samsung drawing program PenUp (sort of).
Most of the artwork here is made with Clip Studio Paint, exported as PNG files and arranged here. The only exception is the very loose pencil sketch in the very top right of the second page in the picture above. That was made using the "Drawing" attachment feature built into Samsung Notes itself.
In the top menu, there's an icon you can click that will show a bunch of things you can attach to your notes. One of them is labeled "Drawing".
Click on "Drawing", and a built-in version of Samsung's drawing app called PENUP will appear on your screen. Saving the drawing will immediately save it to your notes! Granted, what you can do in PENUP is very limited compared to Clip Studio or Procreate, but the fact that Samsung thought to include this at all is very nice!