I am assuming you are using Fusebox to test. When using fusebox you should not have uninstall and re-install, however if you are running in to issue with seeing previous snapshots, you can delete the app in Fusebox by swiping to the right and pressing the red delete button. Only rare circumstances should make that a requirement. Otherwise, simply making a snapshot and opening.closing the app in fusebox should deliver the changes.

Are you seeing the Update screen after making snapshots?