So I am fairly new at trying to export a Power App and import it to a different tennant. I was looking for an explanation and found old stale content about this everywhere. When I finally figured it out, I decided to write it up, so other people could benefit.
Step 1: Assume you have a App open in the the Power Apps Studio: Click on the "...", then click on "Collections"
Step 2: CLick on "Save As" and then This Computer
We will now open this file in a new tenant.
Step 3: In the new tenant open the Power Apps Desiigner, CLick on "New app" and the "Canvas". Give the New App a name. I will call it test
Step 4: Once in the new blank app, click on the "..." and then "Open"
From here it is easy. Point to the file you created in step 1. This will then ask you for connections and you will be up and running.