If you've done gigs before, you know that it is generally not permissible to take photos of anything on your laptop screen.
THIS GIG IS AN EXCEPTION!
You might be completing your food order on your laptop, and therefore you can take pictures there. In fact, we recommend that you take screenshots from your laptop itself while you go through the ordering process, and then take photos of those screenshots while you work through the gig.
If you took screenshots of your phone while you were going through the food ordering process, and now you're having problems uploading your photos to the Gigwalk app, then a simple workaround is to upload your photos to your laptop and then take a photo of the photos from inside the gig.