When uploading to a modern SharePoint library, the form doesn't automatically pop up after uploading to allow you to fill in the required fields.
You can fill the fields in manually using the properties or details panel however users can still work on and save changes in the document when editing in browser even when the required fields are empty, so there's no way to actually enforce the required metadata fields. Also if you're working in the desktop app rather than browser, it stops you from saving your work by saying "required fields are missing data" but you don't get this prompt in browser????
I've seen multiple posts from Microsoft saying that this is a bug or an error and a fix is being implemented however this was almost 5 years ago and it's still the same.


