To add an image via the Mobile Sales App, go to the Inventory tab and select the product you would like to add an image to.
Tap the variant that you would like to add an image for.
Touch the “Add Photo” button at the top right-hand corner of the page.
You will be able to take a photo of your product on an iPhone or choose an existing image from your camera roll. The photo will be added to your collection of photos for that product. If it is the only image for that variant, it will appear in the list view. If the variant has multiple images it will be added to the image carousel and will be available to set as the primary image.