I am on SharePoint 2016 on prem and working with a list of document set libraries that are each shared by a large group of people.
The Problem: I created a new permission level that allows editing, but not adding or deleting. In my tests, the person who is getting this custom permission is able to add and delete files, but her actions do not actually effect the document library - it just APPEARS that it does to the person doing the adding/deleting. In my tests, I am in the document set at the same time and refreshing the page, but am not seeing any changes to the files. The problem is that I don't want people to be confused thinking that they can add or delete (b/c it looks to them like they added/deleted) when in actuality they cannot. A message does appear saying that that the user doesn't have permission to add/delete, but the files still look added/deleted to them, so there is confusion.
My question is: is this normal? Is there a way by using permissions to not give people the option to add/delete?
Thanks for your help!