Open the PDF from your Customer Center, then tap the Share icon.
iPhone: choose "Save to Files" or open it in Adobe Acrobat Reader.
Android: tap Download, then open it from your Files or Downloads app.
On a computer, simply download it and save it to your desktop.
The interactive features work best in the free Adobe Acrobat Reader app (phone, tablet, or computer), and also in Chrome on a computer and the iPhone Files app. Apple Books doesn't support them, so if you saved it there, open it in Acrobat Reader instead.
Remember to save after typing so your reflections stay. And you can always print the pages and write by hand.