How to save to a server

Friends I am developing an application for architecture, which will allow the client to choose furniture from a previously created catalog and add it to their projects. I need that once the furniture has been chosen by my client, he can save a file in this application and synchronize it with a server, so that it can later be loaded in this application and viewed. Does anyone have any idea how I can generate this save file and sync it to a server?

I am basing this application on this website, Programa de diseƱo 3D | HomeByMe

I am practically trying to replicate the same project but based on Unreal Engine 4