I have created 2 videos to show how to use Keynote for App design. The first video explains how to download and install the Keynote templates and the SF-Symbols app via Apple's Developer Portal. The second video details how to use the template and app with Keynote to design your own app. It is a little tricky but the end results can look just like a real app.
Part 1:
[youtu.be/n_1cWnYNp...](https://youtu.be/n_1cWnYNp5U)
Part 2:
[youtu.be/b1YQRJDnY...](https://youtu.be/b1YQRJDnYl8)