upload function in booking form

hello,
is it possible to add a upload form to the booking form? so that a user not only can send the booking but rather can upload files (pdf). there are cases, i need requisite evidence. e. g. the identity card as pdf file. so that i can find in admin area under bookings the bookings and view the files.
jens
is it possible to add a upload form to the booking form? so that a user not only can send the booking but rather can upload files (pdf). there are cases, i need requisite evidence. e. g. the identity card as pdf file. so that i can find in admin area under bookings the bookings and view the files.
jens