This can not understand what? For example, I want to say one of the soda and then one image file to bring soda to say I'm milk like file and then someone will bring a different image file you want milk and it's going to take it. Now you understand?
I think I do! So... you post a request, e.g. "I want soda". Then someone is going to post an image of that. And post a new request, e.g. "I want milk". Someone posts a picture of milk and so on. Am I right?