For Android users, if you had sketches in SketchBook Pro that are now missing, here's what you need to know and do:
On Android, once a sketch is created, images are found in 2 places:
On Android, there are small, low-resolution copies of your images, used as thumbnail images for the SketchBook Pro Gallery. If you open one in SketchBook, it will look terrible, compared to your real image. These are just a copy of your image. We recommend you only use the files found in My Files > Internal storage > Autodesk > SketchBook3.
In the Android version 5.2.2, we added an automatic Gallery file recovery tool. Use this for SketchBook to look for missing files.
To understand what it does and for instructions for manually going through the process, see Gallery File Recovery.