Uploading Files VIA API

I'm attempting to upload files to BOX via the api and am getting the error:

<html>

<head><title>400 The plain HTTP request was sent to HTTPS port</title></head>

<body>

<center><h1>400 Bad Request</h1></center>

<center>The plain HTTP request was sent to HTTPS port</center>

<hr><center>nginx</center>

</body>

</html>

My https destination config is:

description = "Retrieve Box Data";
host = "upload.box.com";
port = 443;
pathPrefix = "/api/2.0";
authType = none;
useSSL = false;
timeout = 10000;
sslHostCheck = true;
sslAuth = anonymous;

Additionally, my tokens are valid and this is working in Postman. Can someone advise on what is missing? Does my authType or useSSL need to be adjusted?

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