What is the best way to design a database for cloud storage (files)?

Question

Database design

You need to make your file storage in the "cloud", such as Google / Yandex / mail, etc., while I started with designing a database for this business.
I made a database schema, you can tell me what else you can add / remove or help with advice, I think that something is missing and I would like to decide in advance so as not to redo it.

Will work on ASP.NET MVC and MS SQL.
To work with files, there will be a Web interface and WebApi.
Access to files will be both via direct links and via api from another IS (therefore, differentiation by fields, or without roles, but with a referral link check, i.e. if it’s not my domain, then you can’t download it) + you need to have digital signatures for files .

I plan to organize files on the server in the following format:
Option 1.
-files(root)
Option 2: -files ( root)
--bfa0dd80-76f2-4b9c -99bc-e63197277ed9(directory ID) ---026f8e459c8f89ef75fa7a78265a0025(file name(calculate MD5 hash to avoid duplicates)) Database version at the moment:

Answer 1

you take these
https://habr.com/ru/post/430970/
well, or 1-2 if there is not enough time, you set it and see how and what is organized, you
highlight the same patterns