It wasn't shown in the video but the 'save to device' button on the final page redirects you to a browser window, from where u can download the signed document
file/var/folders/jw/6pbnfrwn5bqcc0wj3rf7bz_r0000gn/T/com.apple.useractivityd/shared-pasteboard/items/5C0516C9-3AB3-43C6-8D86-4A001A71D27E/IMG_1598.png
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