How can I get notifications as displayed in the following walkthrough.

Video: https://helpx.adobe.com/creative-cloud/how-to/creative-cloud-share-files-collaborate.html‌

I would like to get a notification when my co-worker edits and updates a file in our "collab" folder.

The file updates, but I do not get a notification and it does not show on my activity feed either.

Please help out