I moved a Proton Doc 'file' (link) out of the Proton Drive folder on my Mac, which seems to have the same effect as deleting the document.

Trying to open the link from outside the Proton Drive folder gives an error: "This file type can only be opened from within Proton Drive." The link still won't work even if I put it back inside the Proton Drive folder. After doing this, trying to open the file throws up the same error but also creates a "Revision is currently not enabled" sync error in the menu bar icon.

This is jarring behaviour that breaks a long-established mental model about how files and folders on a desktop OS should work. It means that I have no trust in Proton Docs as a place to store any document.