You can only edit, replace or delete images which you uploaded.
To edit the details for an image or document in the Media Gallery:
- Click Media in the tool bar. Navigate to or search for the item you wish to edit.
- Select that item.
- Select Edit Details in the righthand sidebar.
- Choose Upload Media below the thumbnail to replace the file for the image.
- Choose Move to Trash to remove the item from the Media Gallery.
- Click Save Changes (or Cancel).