There have been a number of questions around how to manage JSON files for recipes and sessions. Until the UI has buttons and features built into it (takes longer than just raw file manipulation) you are going to have to resort to Samba/Network Share access to these features.
Below I'll talk through the steps in picture form of doing this from both a Windows computer and a MacOS computer.
Take note that my main "chiefwigms/picobrew_pico" deployment is called "PICOBREW-LOGGER" as I have a bunch of logging enabled at the network layer. This helps me to be able to better the experience of the server for everyone as well as to map requests from mothership if I need to. Yours will be called "PICOBREW" by default and whatever you named it via the embedded