HI Julien,
Sorry it took so long but i finshed my tutorial.
Go to my website and make an account.
Go to the members area and go to the Form submit/update page.
It should do what you need and i added some info below it.
https://volkaertskristof.wixsite.com/helpcenter
Also let me know your toughts about the tutorial.
didn’t had much time so there aren’t any images. only a live example
Kind regards,
Kristof.