@pitaj I did some testing today with /categories 404'd. Seems as though things continued to work fine. I'm not disabling the functionality, just access to the page.
@baris Indeed, I was logged with admin account. I tried with a regular user and it works correctly. The "Upload Image" button does not show and uploading with CTRL+V gives me the following error:
Thanks for clarifying and sorry for the misunderstanding.