This feature is still actively being worked upon. I’ll let you know as we get closer to release.
Teams could be great with this feature. It has been requested by many since 2016. Will we ever see it? If there are fundamental problems please tell us. It is an essential feature for using Teams as central communication and file access tool. Differentiated permissions as in traditional SharePoint are important too.
The feature team is still reviewing, there is lots of discussion about this item and I hope to have a decision soon.
This feature request is still on the backlog. But it continues to make its way through the queue. I’ll keep you posted as the progress develops.
Unfortunately due to re-prioritization this item has slipped back onto the “backlog” for the time being.
I hope to see it move back into “working on it” soon and will continue to engage the feature team with your feedback.