POST /assets. I can't figure out how to send the file data, however. Currently, my code looks like this:Content-Type header, I get a validation error saying the various fields are missing.Content-Type: multipart/form-data, I get a Multipart: Boundary not found error.Content-Type: multipart/form-data; boundary=---WebKitFormBoundary7MA4YWxkTrZu0gW, I get a Multipart: Unexpected end of form error.