Proton Drive on Windows privacy concerns

When downloaded, Proton Drive has its own file with cloud storage, allowing you to access files on your drive from your computer, vice versa. My main concern is regarding the “Always keep on this device” and “offline mode” features for both PC and phone. Does using these features lessen or remove the privacy advantage that Proton promises? Are you essentially allowing Windows to see your files? Or does it work similarly to VeraCrypt, where once you’ve entered your password it …

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