How to register a post service to an Eliom client/server app?

Learning
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9

I double checked and it worked (with test.byte). If you are interested in such a bug my config is given there Can you share your secret to make ocsigen-start work?

Thanks for your advice and both links !
Unfortunately, it seems that the first tutorial is broken, as the code leads to this error message I do not understand:

File "upload_pic.eliom", line 17, characters 30-36:
Error: This expression has type
         ?use_capture:bool ->
         #Js_of_ocaml.Dom_html.eventTarget Js_of_ocaml.Js.t ->
         Js_of_ocaml.Dom_html.event Js_of_ocaml.Js.t Lwt.t
       but an expression was expected of type
         ([< Html_types.input ] as 'a) Eliom_content.Html.To_dom.elt =
           'a Eliom_content.Html.elt
Makefile.os:284: recipe for target '_client/upload_pi.cmo' failed
make: *** [_client/upload_pi.cmo] Error 2

error matches “submit” of line “clicks (To_dom.of_input submit)”.
The second resource is a bit difficult to me right now, I imagine I can get inspired with demo_notif.eliom in ocsigen_start.
By the way, I think I can use an action (with NoReload, or a Unit), and maybe I can get feed-back from the server with a notification, when I learn to use it.

Thanks again for your precious help !
Best !