How to upload to a specific YouTube channel of the same account? (YouTube Data API)
<p>I am managing a Google account and it has a YouTube channel connected to a Google+ profile, and a YouTube channel connected to a Google+ page. Using a OAuth key of this account, I want to upload videos to the "page"'s channel, so far I've only managed with the "profile"'s channel. The "page" channel has our company name and logo, so I don't want it to be a personal (at least appear to be) "profile"'s channel</p>

<p>I'm using a script almost identical to the video upload sample script:</p>

<p><a href="https://developers.google.com/youtube/v3/code_samples/php?hl=en#upload_a_video" rel="nofollow noreferrer">https://developers.google.com/youtube/v3/code_samples/php?hl=en#upload_a_video</a></p>

<pre><code>&lt;?php

// Call set_include_path() as needed to point to your client library.
require_once 'Google/Client.php';
require_once 'Google/Service/YouTube.php';
session_start();

/*
 * You can acquire an OAuth 2.0 client ID and client secret from the
 * Google Developers Console &lt;https://console.developers.google.com/&gt;
 * For more information about using OAuth 2.0 to access Google APIs, please see:
 * &lt;https://developers.google.com/youtube/v3/guides/authentication&gt;
 * Please ensure that you have enabled the YouTube Data API for your project.
 */
$OAUTH2_CLIENT_ID = 'REPLACE_ME';
$OAUTH2_CLIENT_SECRET = 'REPLACE_ME';

$client = new Google_Client();
$client-&gt;setClientId($OAUTH2_CLIENT_ID);
$client-&gt;setClientSecret($OAUTH2_CLIENT_SECRET);
$client-&gt;setScopes('https://www.googleapis.com/auth/youtube');
$redirect = filter_var('http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'],
    FILTER_SANITIZE_URL);
$client-&gt;setRedirectUri($redirect);

// Define an object that will be used to make all API requests.
$youtube = new Google_Service_YouTube($client);

if (isset($_GET['code'])) {
  if (strval($_SESSION['state']) !== strval($_GET['state'])) {
    die('The session state did not match.');
  }

  $client-&gt;authenticate($_GET['code']);
  $_SESSION['token'] = $client-&gt;getAccessToken();
  header('Location: ' . $redirect);
}

if (isset($_SESSION['token'])) {
  $client-&gt;setAccessToken($_SESSION['token']);
}

// Check to ensure that the access token was successfully acquired.
if ($client-&gt;getAccessToken()) {
  try{
    // REPLACE this value with the path to the file you are uploading.
    $videoPath = "/path/to/file.mp4";

    // Create a snippet with title, description, tags and category ID
    // Create an asset resource and set its snippet metadata and type.
    // This example sets the video's title, description, keyword tags, and
    // video category.
    $snippet = new Google_Service_YouTube_VideoSnippet();
    $snippet-&gt;setTitle("Test title");
    $snippet-&gt;setDescription("Test description");
    $snippet-&gt;setTags(array("tag1", "tag2"));

    // Numeric video category. See
    // https://developers.google.com/youtube/v3/docs/videoCategories/list 
    $snippet-&gt;setCategoryId("22");

    // Set the video's status to "public". Valid statuses are "public",
    // "private" and "unlisted".
    $status = new Google_Service_YouTube_VideoStatus();
    $status-&gt;privacyStatus = "public";

    // Associate the snippet and status objects with a new video resource.
    $video = new Google_Service_YouTube_Video();
    $video-&gt;setSnippet($snippet);
    $video-&gt;setStatus($status);

    // Specify the size of each chunk of data, in bytes. Set a higher value for
    // reliable connection as fewer chunks lead to faster uploads. Set a lower
    // value for better recovery on less reliable connections.
    $chunkSizeBytes = 1 * 1024 * 1024;

    // Setting the defer flag to true tells the client to return a request which can be called
    // with -&gt;execute(); instead of making the API call immediately.
    $client-&gt;setDefer(true);

    // Create a request for the API's videos.insert method to create and upload the video.
    $insertRequest = $youtube-&gt;videos-&gt;insert("status,snippet", $video);

    // Create a MediaFileUpload object for resumable uploads.
    $media = new Google_Http_MediaFileUpload(
        $client,
        $insertRequest,
        'video/*',
        null,
        true,
        $chunkSizeBytes
    );
    $media-&gt;setFileSize(filesize($videoPath));


    // Read the media file and upload it chunk by chunk.
    $status = false;
    $handle = fopen($videoPath, "rb");
    while (!$status &amp;&amp; !feof($handle)) {
      $chunk = fread($handle, $chunkSizeBytes);
      $status = $media-&gt;nextChunk($chunk);
    }

    fclose($handle);

    // If you want to make other calls after the file upload, set setDefer back to false
    $client-&gt;setDefer(false);


    $htmlBody .= "&lt;h3&gt;Video Uploaded&lt;/h3&gt;&lt;ul&gt;";
    $htmlBody .= sprintf('&lt;li&gt;%s (%s)&lt;/li&gt;',
        $status['snippet']['title'],
        $status['id']);

    $htmlBody .= '&lt;/ul&gt;';

  } catch (Google_Service_Exception $e) {
    $htmlBody .= sprintf('&lt;p&gt;A service error occurred: &lt;code&gt;%s&lt;/code&gt;&lt;/p&gt;',
        htmlspecialchars($e-&gt;getMessage()));
  } catch (Google_Exception $e) {
    $htmlBody .= sprintf('&lt;p&gt;An client error occurred: &lt;code&gt;%s&lt;/code&gt;&lt;/p&gt;',
        htmlspecialchars($e-&gt;getMessage()));
  }

  $_SESSION['token'] = $client-&gt;getAccessToken();
} else {
  // If the user hasn't authorized the app, initiate the OAuth flow
  $state = mt_rand();
  $client-&gt;setState($state);
  $_SESSION['state'] = $state;

  $authUrl = $client-&gt;createAuthUrl();
  $htmlBody = &lt;&lt;&lt;END
  &lt;h3&gt;Authorization Required&lt;/h3&gt;
  &lt;p&gt;You need to &lt;a href="$authUrl"&gt;authorize access&lt;/a&gt; before proceeding.&lt;p&gt;
END;
}
?&gt;

&lt;!doctype html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Video Uploaded&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
  &lt;?=$htmlBody?&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>As mentioned, the script works for the channel that was connected to the "profile" .. I've since deleted this as it was just for testing. I want to upload videos instead to the other Google+ "page"'s channel which is also owned by this account. So far I've tried setting the desired channel as the default of this account, but do I need to actually move the channel to the Google+ "profile"? .. unless I can specify channel in the above script? If I move the channel, will it retain the channel's name though? I don't want anything about the channel to change (name, logo). From what I see it will change the channel name (see image) which is not ideal, I just want to upload to this channel - that's all</p>

<p><a href="https://i.stack.imgur.com/ZYdY2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZYdY2.png" alt="enter image description here"></a></p>