I want to take a picture from the user in one screen and show this picture in another screen

[Taifun]

Learn to work with lists

Imagnity.com List Tutorial, Mirrored - @Saj

(copied from imagnity.com, courtesy of @Saj) List Blocks On App Inventor by Sajal Dutta | app-inventor, tutorials | 102 comments List is a necessity in almost every app regardless of what programming language you use. This is the easiest way to create and manipulate a set of values/items/elements in an ordered fashion. Please go over the reference before we start. In this tutorial, we will learn how to create a list, add new items to a list, display list items, replace an item in the list, rem…

And store your images as a list under your tag images in TinyDB

Then use the select list item block to display different images

Btw. you not necessarily need different screens, see tip 1 here General Tips and Tricks for App Inventor

Taifun