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Your phone opened this file in a quick preview that blocks the interactive study tools from loading — this isn't a broken file, it just needs to open in a full browser.
iPhone: tap the Share icon and choose “Open in Safari,” or in the Files app press and hold the file and choose “Open in Safari.”
Android: tap the downloaded file and choose to open it with Chrome (or your default browser) instead of a built-in viewer.
Once it opens in the browser itself, all 156 cards and the section filter will load normally.