Python Flask for FilePond text file upload

My application has a Python Flask back-end and a JavaScript / Facebook React front-end. It needs to process text supplied by the user. It already works fine with text typed by the user in a input field. I now want to let the user also update multiple local files to the server. For a nice user experience, I want to use the Filepond library ([login to view URL]). The new client-side code is trivial: ``` ``` But, I don't know how to write the corresponding server endpoint. What I want from you is a toy sample app, using Flask and react-filepond which: - Prompts the user for a multiple local text files, as well as one input text (which can be empty) - Also has a "do it now" button on the client - When "do it now" is pressed, the Flask server should show (in the log or server stdout) the contents of each of the uploaded files and the input box.