How do I add pictures to my dishes?

Open the item (or the Add item form), tap the Photo control and press 'Upload a photo' — the image is squared to 800×800 and compressed on your own phone or computer before it uploads, then attached when you save the item. Pasting a hosted image URL works too, and the Excel import's Image Filename column still takes full web addresses for bulk work. Clear the field and save to remove a photo.