Explanation:

Step 1: Create an empty environment variable named Custom Text Placeholder.
Applications often require different configuration settings or input parameters when deployed to different environments. Environment variables store the parameter keys and values, which then serve as input to various other application objects. Separating the parameters from the consuming objects allows you to change the values within the same environment or when you migrate solutions to other environments.
Step 2: Create a function to retrieve the value from the custom text placeholder and display the notification.
Step 3: Export the solution
You can manually export solutions. Microsoft recommends that you create an unmanaged solution to use for exporting your customizations, and then export your customizations periodically so that you have a backup in case anything happens.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/data-platform/environmentvariables
https://docs.microsoft.com/en-us/powerapps/maker/data-platform/export-solutions

Explanation:

Explanation:

https://learn.microsoft.com/en-us/power-apps/maker/canvas-apps/working-with-test-studio

Liquid is an open-source template language integrated into portals. It can be used to add dynamic content to pages, and to create a wide variety of custom templates. Using Liquid, you can:
* Add dynamic content directly to the Copy field of a webpage or the content of a content snippet.
* Store source content by using web templates, entirely through configuration within Power Apps, for use throughout the Power Apps portals content management system.
* Render a website header and primary navigation bar, entirely through configuration within Power Apps.
Note: page is one of the available liquid objects.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/portals/liquid/liquid-overview
https://docs.microsoft.com/en-us/powerapps/maker/portals/liquid/liquid-objects#page