I've been a Proton "Unlimited" subscriber for many years but only use it for mail and VPN. Drive has never worked for me. Other than being incredibly slow compared to others I've tried, some files would get there but usually I'd get a "Something went wrong" message and would not know what files were correctly stored and what files "went wrong." Every few months I'd give it another try, send off a few dozen files and as I recall, I only ever once had a perfect result. All the other times "Something went wrong." It appears to me that Drive is more of an archive type file storage than a real-time update service such as Dropbox so I wouldn't expect WebDAV to work too well, the lag would probably cause timeouts of some sort.

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