Proof Approval App

Hello everyone!

I recently installed Nextcloud on my business website in an effort to streamline proof approvals for my print clientele. I was wondering if an app exists where I can upload a file (PDF generally), have a client view it in the browser and click either “Approve” or “Reject”? Or if this was something that already exists in the installation that I missed?

Thanks in advance for the assistance, and also for the wonderful app!

That would be great to have.
Did you ever succeed in finding a solution?