Hire a Mobile App Developer

So what i am after in an app is something like this one: "smart picture creation" that we use in one of our shops. It works on the following way. A customer will download the app, register to the app, they can then choose their photos from the device, (one of the biggest issues with this is that it wont recognize anything on the cloud storage so if there is a way around this). They then choose the size and the quantity of photographs they want and submit the order, we would also want the facility for them to pay for the order on the app. The order then is finalized and submitted and we get a notification that an order is available for us to print. we would require to either receive the images with the order that can be downloaded and printed or collect the images from an order folder from an FTP site. We dont have a deadline for this and we do not have hosting either at the moment. We have a download website but i am not sure if it would work successfully to integrate into an app.