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Because the frame is tied to the size of the document, the image inside the frame will also resize with the document resizing. And, the proportional fit will remain.
Adding more elements
From here on, it's up to you to add even more elements. You choose where these elements align on, and how they should behave.
CopyFitting
When combining features like a dynamic frame size, and e.g. Copyfitting, you can have the text grow in proportion to the Add size.
Output
You're Add is now ready to be exported.
Just set the output size you want, choose the output settings, and your add is ready to be created.
