I want to create a Field Service Management App that will function as both a mobile application and a local Windows server backend. The application needs to store customer information, and I also need to be able to assign new jobs and logs to our 3 engineers. The engineers also need to be able to create invoices based on the work that is given to them and upload them back to the server, where they will be stored in the customer folder. Additionally, any photos shot on-site would have to be kept on the local server in that particular customer folder.