iPhone
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Open the Mail app (or Gmail/Outlook if that's what you use) and open the email from The Book Digital Store.
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Tap the download link or button in the email. It will open the PDF right in the Mail preview or in Safari.If Safari asks whether to open or download, choose the option to open it.
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With the PDF on screen, tap the Share icon — the square with an arrow pointing up, usually at the bottom or top of the screen.
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From the share sheet, tap Save to Files.
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Choose a location — On My iPhone or iCloud Drive both work fine — then tap Save.
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To read it any time, open the Files app and look in the folder you picked. Tapping the PDF opens it directly.