Is it possible to populate an input file automatically.

I try by myself but I'm no enough good find a solution to do it.

I can't do it in the console like if i do it manually. I think JS is the way to do it, each time the same file in the same input...

Same code as this example : https://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_input_type_file