Hi Zeroic,
Thanks for replying to my post.

Well, I do not know how to send a file as a dynamic field. I can easily select a file and send it as a static file (as shown in the screen shot in OP), however, I cannot figure how to instruct the API to ask for a file from my computer.

Do you mean that the API configuration is correct but the issue is the worflow configuration instead?

Thanks!