Generate a unique link to individual files that aren’t publicly accessible.
In Google Drive, right click any file > share > copy link

You get a link to that file which you can add in to my own files, into docs, calendar entries, etc. In this way, I've built out my own system, where I once logged in, I can navigate from calendar to an important contract, or from docs / sheets, to an associated PDF / image, etc.

Include support, so that the linked files open in the relevant app, not kicking the user out of the mobile app to a browser.

On Proton Drive, it seems like I can only create shareable links. Anyone with that link can view the file, no login required. Is there already a way to generate “private” links i.e. just for me. Having secure, per-file links would be a huge plus for sensitive docs without opening them to the world.