This should be simple, but I may be missing something. I have a Shapefile that sits on my company local drive, that gets updated daily, which I then publish as a Hosted Feature Service in my Portal. I Overwrite the feature service once a day when I re-publish to Portal. As far as I can see, I can overwrite my content, by no one else can overwrite the content I publish. I've added the layer to a specific group, added specific group members with publisher access, added the ability to edit the data....but they can not see the layer when they try and overwrite it in ArcGIS Pro, because they are not the owner.
Is this normal behavior, am I missing something?