Steps to reproduce it
- Add a regular role then define the permissions as follows
- Site Administration> Content & Data > Documents and Media > GENERAL PERMISSIONS > Check Access in Site Administration
- Add a new user and assign the role to her
- Go to DM > Metadata Sets
- Assert Add button shows
No add button shows for Metadata Sets
Add button shows, if you try to add a metadata set, but fail to add it, says: Error:Your request failed to complete.