A file API to rule them all?

Hi indie hackers !

I've been thinking for a while of a file manager that you could easily add to your SaaS. I submit this post to get your precious feedback and thought !

Let's say you build a B2B SaaS where you customers need to access files you want to share with them : billings, contracts...how would you do it ?

Personally, I had to develop a custom integration to a AWS S3 bucket where I store all my clients files. I would have loved a solution having :

• A back-office where I can configure my S3 bucket and add files (also possible by API)
  linked to my clients
• An API to push files automatically to the client from any other tool or app that build the file
• A customizable React component (or else) that could be added to my SaaS. This component could easily display the files of my clients, provide nice search/filters functionalities...

Thank you community !