title: Unable to post comment on someone else's Facebook Album in the same group using Graph API
body: <p>I am creating a new album using: </p>
  
  <pre><code>$album_post = array(
              "message" =&gt; $messageToPost,
              'name' =&gt; 'Album name'
          );
  Facebook::post('/' . $Facebook_Group_Id . '/albums', $album_post, $longToken)
  </code></pre>
  
  <p>Here longToken is generated using following:</p>
  
  <pre><code>$url = "https://graph.facebook.com/oauth/access_token?grant_type=fb_exchange_token&amp;client_id=" . env('FB_ID') . "&amp;client_secret=" . env('FB_SEC')."&amp;fb_exchange_token=$user-&gt;fb_access_token";
  
  $longToken = file_get_contents($url);
  parse_str($longToken, $lToken);
  $longToken = $lToken['access_token'];
  </code></pre>
  
  <p>It has created the album successfully.
  Now I want to post a new comment on that album. But I am unable to do that. I am using following code:</p>
  
  <pre><code>$post = array(
    "message" =&gt; $comment
   );
  Facebook::post('/' . $albumOwner-&gt;fb_user_id . '_' . $album_id . '/comments', $post, $longToken)-&gt;getDecodedBody();
  </code></pre>
  
  <p>It is posting the comment if album owner/author is trying to post the comment. 
  But if someone else try to post comment on the same album, its giving error. </p>
  
  <p>E.g I am <strong>Mr. W</strong> and my friend is <strong>Mr. Z.</strong></p>
  
  <p>We both joined a group.</p>
  
  <p>Mr. W created a new album in that group and posted photos into that. Now Mr. Z came into group and saw that album, he can post comment on Facebook. But if Mr. Z try to post comment using Graph API, using the method posted above, application gives following error:</p>
  
  <pre><code>FacebookResponseException in FacebookResponseException.php line 111: An unknown error occurred
  </code></pre>
  
  <p>I have also tried in Graph API explorer, it works If I use Mr. W access token, but cannot post comment if I use Mr. Z's access token. </p>
  
  <p>Using following FB permissions: </p>
  
  <pre><code>['publish_actions', 'email', 'user_location', 'user_hometown', 'user_birthday', 'user_photos'] 
  </code></pre>
  
  <p>these are for both Mr. W and Mr. Z. Same permissions for both of them.</p>
  
  <p>Please help, or clarify if its not possible using graph API. </p>