A basic mockup of a sign-up/sign in screens along with a 2-way authentication of a uniquely generated code each time.

Going to a screen depending on a picker selection using states, variables and the 'Fire an items event' action

Here is an example of a scrollable data table with vertical and horizontal scroll and a fixed header. Data design: https://www.sketchappsources.com/free-source/3706-datatable-with-horizontal-scroll-sketch-freebie-resource.html

Graphics & Credit from: https://www.sketchappsources.com/free-source/3805-clean-web-login-form-sketch-freebie-resource.html. A simple Login page of a webpage using interactive Proto.io components.