Don’t delete and redownload.
The app would crash l in the middle of a picture and I would lose all the progress of the picture which with some of the larger pictures can be pretty frustrating. Sometimes the app won't open and if it does it crashes like crazy. Finally I deleted and redownloaded it. There is no setting to automatically go into the next color like there previously was. Honestly for me that makes this super frustrating. Really considering being done with this app.