Images can be uploaded for wallpapers and logos. These will be displayed on the login page and the logo will be used in the banner in an email.

To upload a wallpaper or logo, go to Control Panel > Customisation > + Add Images.

You do not need to upload both images every time, if a logo changes but not the wallpaper uploading a new logo will not affect the wallpaper and an image will only be updated if it has a replacement.