This article gives you a list of all image sizes to be added to your learning content.
Exam
Large Question image (on top): 498×280
Small answer image: 90×62
Medium answer image: 260×180
Large answer image: 430×430
Logo image: 150×50
Course
Background image for the Start slide: minimum 1280×800
Title background image: 1280×800
Content slide image: Will be scaled to different formats. For the best result for content width alignment, make sure the image has a minimum width of 700px or higher. The file also needs to be below 10MB.
Background image: minimum 1280×800
Breakout image: 1280×800. Smaller images will be upscaled.
Academy
Logo image: 300×100
Background image/login page: 960×1080