Uploading logos or images will allow you to customize the solution.
Background image for login page is typically used when all users only book in Planner web and not through Outlook. An image uploaded here will be visible for when they log in. If you activate Text for login page, users will see this text along with the image.
Logo image for bright background; this will then be visible on the login page. Note that you must also enable Custom Login Page for the above to appear on the front page.
Logo image for dark background will be seen in the top black bar users see when using the solution, right next to the Pronestor logo.
Remember to click Save after uploading an image.