Every module tab has a Module Image and a Header Image row (for example Packs: Module Image, Packs: Header Image). To upload, click Choose File on that row and pick a picture - the page submits and saves as soon as a file is selected, then jumps back to the same tab. The file is stored under the setting's own name with its original extension (JPEG is normalised to jpg). To remove an image, click the small X next to the current file name; the setting is cleared and the module falls back to Sprwt's default image. The Module Image is the picture used on the module card in the site's ordering menu, while the Header Image is the banner shown at the top of that module's ordering page.