(Objective-C) VoiceBase -- Upload a media file for transcription and analysis

This example demonstrates how to upload a media file for transcription and analysis. It duplicates the following curl command:

curl https://apis.voicebase.com/v2-beta/media \
  --form media=@msg_123_abc.wav \
  --header "Authorization: Bearer ${TOKEN}"

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#import <NSString.h>
#import <CkoHttp.h>
#import <CkoHttpRequest.h>
#import <CkoStringBuilder.h>
#import <CkoHttpResponse.h>
#import <CkoJsonObject.h>

// This example assumes the Chilkat HTTP API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Insert your Bearer token here:
NSString *accessToken = @"VOICEBASE_TOKEN";

CkoHttp *http = [[CkoHttp alloc] init];

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
req.HttpVerb = @"POST";
req.Path = @"/v2-beta/media";
req.ContentType = @"multipart/form-data";

// Add the access (bearer) token to the request, which is a header
// having the following format:
// Authorization: Bearer <userAccessToken>
CkoStringBuilder *sbAuth = [[CkoStringBuilder alloc] init];
[sbAuth Append: @"Bearer "];
[sbAuth Append: accessToken];
[req AddHeader: @"Authorization" value: [sbAuth GetAsString]];

BOOL success = [req AddFileForUpload2: @"media" path: @"qa_data/wav/msg_123_abc.wav" contentType: @"audio/x-wav"];
if (success != YES) {
    NSLog(@"%@",req.LastErrorText);
    return;
}

CkoHttpResponse *resp = [http SynchronousRequest: @"apis.voicebase.com" port: [NSNumber numberWithInt: 443] ssl: YES req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// Examine the response status code and body.
NSLog(@"%@%d",@"Response status code = ",[resp.StatusCode intValue]);

// The response should be JSON, even if an error.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: resp.BodyStr];
json.EmitCompact = NO;

NSLog(@"%@",[json Emit]);

// A successful response will have a status code = 200
if ([resp.StatusCode intValue] != 200) {
    NSLog(@"%@",@"Failed.");
}
else {
    NSLog(@"%@%@",@"mediaId: ",[json StringOf: @"mediaId"]);
    NSLog(@"%@%@",@"href: ",[json StringOf: @"_links.self.href"]);
    NSLog(@"%@%@",@"status: ",[json StringOf: @"status"]);
    NSLog(@"%@",@"Success.");
}

// Here is an example of a successful response:

// 	{ 
// 	  "_links": { 
// 	    "self": { 
// 	      "href": "/v2-beta/media/856a1e85-c847-4c3c-b7a4-6cf15cd51db4"
// 	    }
// 	  },
// 	  "mediaId": "856a1e85-c847-4c3c-b7a4-6cf15cd51db4",
// 	  "status": "accepted",
// 	  "metadata": {}
//