So in addition to the binary data in the filename.value
field you’d like to send a string in the fieldId
field? That’s a bit tricky at the moment I am afraid and not supported by the HTTP Request node (which sends either JSON data or binary data, but not both at the same time).
@RicardoE105 provided a workaround for this a while back:
This example uses a Function node to perform a request similar to what you have in mind (the HTTP Request node from the example simply fetches an example file). Would this work for you?