Import a sequence of image file.
All of the images get imported as Branch Tables with Previous and Next answers.
Upload a zip file with image files (it can contain subfolders). The files will be ordered based on the filenames. If the filename contains a number, it will be sorted numerical by this number, otherwise in alphabetical order.
To export images from PowerPoint:
The images would have been saved as course files in moddata/XY where X is your lesson's name and Y is a number (usually 0).