I explain this in my session at XDC 2018 in Denver, if you have access to the videos.
Most developers forget that when releasing an app on any app store,
You should spend as much time and resources into marketing as you should in development
Developers usually focus on the product, making a good app, most of the times with no bugs, a good UI/UX but usually forget about the marketing.
App Store screenshots are part of the marketing. They should be meaningful, appealing to the person who is browsing the store and make them want to discover more.
Let's compare these two images for Packr
Screenshots of an app are the first sneak peak a user will get about the app. The first 5 seconds are decisive when a user searches for an app and is browsing all results.
Your screenshots should send a message.
The image on the left is colorful, but doesn’t really send a message.
The one on the right has a title that describes what the app can do. It also presents the actual device frame which helps the user see what he will have in his hand when using the app.
What I meant about "Create an awesome presentation" is to appeal the user within the first second of seeing your App on an app store.
Jetpack is an easy to use template to present screens of your iOS app with a mockup device frame, bright colours and a title that explains what the app does.
The word "screenshot" I use can be understood in two ways:
(1) The image saved to your Desktop hitting cmd+S in the iOS Simulator
(2) The actual image you upload to iTunesConnect when publishing an app
Fastlane/Frameit and Jetpack will not help with (1)
But they definitely help with making a better version of (1) when using it for (2)