POST binary body is ignored when request is run as part of the collection

I am trying to make a collection of 3 requests, where the first one is POST request that is supposed to post the content of a file (the API expects a Stream). The file can be either csv, Excel, etc.
When making the request, the binary format is chosen.
When the request is ran manually all works well.
When the request is added to a collection though, the payload is not sent.
Any advice will be highly appreciated.