You have a canvas app. The canvas app must store data in a variable that is available only to the current screen. You need to create the variable…

The requirement is to create a variable available only on a single screen. This type of variable is known as a context variable.

The UpdateContext function is the primary method for creating and updating context variables for the current screen. These variables are only visible and accessible within the screen where they are defined.

The Navigate function, while primarily used for screen transitions, has an optional third argument that allows you to pass a record to create or update context variables on the destination screen. This effectively creates a variable scoped only to that new screen.

C. Set: This function creates or updates a global variable, which is accessible from all screens within the app, violating the single-screen requirement.

D. Collect: This function creates or adds data to a collection. Collections, like global variables, are available throughout the entire app.

E. SaveData: This function is used to store a collection or global variable on a local device for offline use; it does not create screen-scoped variables.

1. Microsoft Learn. (2023). Understand canvas-app variables in Power Apps.

Section: Types of variables. This document explicitly distinguishes between global variables and context variables. It states

"Context variables are scoped to a screen... Use the UpdateContext and Navigate functions to create and set context variables."

2. Microsoft Learn. (2023). UpdateContext and Navigate functions in Power Apps.

Section: UpdateContext function. "Use the UpdateContext function to create a context variable

which temporarily holds a piece of information... Context variables are scoped to a screen

which means that you can't build a formula that refers to a context variable on another screen."

Section: Navigate function

Syntax. The documentation details the third argument for Navigate: Navigate( Screen

Transition

[UpdateContextRecord] ). It explains

"This record updates the context variables of the new screen as if the UpdateContext function were used."

3. Microsoft Learn. (2023). Set function in Power Apps.

Section: Overview. "Use the Set function to set the value of a global variable... Global variables are available on all screens of the app."

4. Microsoft Learn. (2023). Collect

Clear

and ClearCollect functions in Power Apps.

Section: Overview. "Like a global variable

a collection can be used on any screen in your app."