Until I want to share with say… anyone that isn’t on HN :)
If they want to collaborate, they can just post the changed file, using the auth key you generated for them set in some header field, to https://files.<your domain>/<id here>, which could automatically increment revision numbers. Then you could access specific revisions with .../<id here>/rev/<revision>.
So much easier than installing an app! You could literally just use curl as the interface! (I kid)