Favor invite-only access with expiration dates, avoid open links, and audit who can reshare or download. Set default privacy for new folders, not just files. These choices prevent a single careless toggle from broadcasting sensitive attachments across indexers, chat previews, public embeds, or unintended partner workspaces.
When a provider lacks end‑to‑end encryption, consider pre‑encrypting archives or documents that contain identifiers, financial details, or private notes. Store keys separately and share via distinct channels. Layering protection thwarts opportunistic access, discourages casual snooping, and buys time if a vendor suffers a misconfiguration or breach.