Currently, Proton Mail doesn't allow users to define a specific download folder for attachments, nor to apply restrictions to them.

However, email remains the primary vector for phishing and malware, with increasingly sophisticated attacks (social engineering, credible content, AI).

The ability to force attachments to be downloaded to a dedicated folder (local, NAS, sandbox, VM) would significantly reduce risks, removing the human element from security alone.

Such a feature would be particularly useful for advanced users, hybrid environments, or professional use cases, and would integrate seamlessly with the filters and aliases already present in Proton Mail.

This would further strengthen Proton's position as a security-oriented solution by default, not just for encryption.

In addition, Proton already provides Proton Drive, which would be a natural and highly valuable option as a default or selectable destination for attachments.