There are a couple of ways you can move drawings between folders and apps. To move drawings between folders:
  1. Tap+hold+drag a drawing (tap additional drawings to add more to your selection) to the side of your folder to switch to the next one, then drop it in.
  2. Tap+hold+drag to select a drawing, then open the folder dropdown menu in the status bar and drag your drawings into the new folder there.
  3. If you’re moving drawings to a new app (like Files), tap+hold+drag your drawing(s), open the new app from the control bar or by double-tapping your home button to show all the active apps on your device, and choose the new app. Release your selection in the new app.

For a visual guide, follow along with our Walkthrough Series tutorial: Gallery Interactions. (YouTube)