SharePoint via MS Teams Document Library not handling mandatory columns metadata

Question

Observe in the following screen shot that there are two blank columns on the right handside: WBS# and Theme Key

These should not be blank. I configured them to be mandatory and unique. For example, I configured them by clicking to the document library settings like this:

Settings->SiteContent->Settings (for doc lib) and view the following two screen shots:

And here you can see that mandatory settings, among other settings. Just showing Theme Key for the example (WBS# is configured the same way).

Can anyone explain to me how to obtain the behavior associated with the desired configuration? It is as if the SharePoint settings are being ignored.

Note that I am using Microsoft Teams and started this SharePoint site from that tool. It is using the new Modern UI. I am a team/sharepoint owner, but not the admin for either MS Teams or Sharepoint. I can contact the admin if needed.

Answer 1

This is the new configuration when viewed through the modern interface. Required metadata is no longer required on upload, but required only when the properties are edited.

What you're seeing is 'by design'.