Where does the error come from when loading large images?

Question

Yii

Good day!
The first time I encountered yii (yupe) I hope for indulgence)
When uploading images ~ > 1mb, it gives an error in the alert

-200 - HTTP error

upload_max_filesize set to 1000M did not help, all the restrictions that I found in the code have a value of 5368709120, it seems to me that this may not be relevant at all)

jQuery('#ArdArticle_image').cover({'sizes':{'1':{'width':462, 'height':397},
 '2':{'width':462, 'height':181},
 '3':{'width':216, 'height':181}},
 'coords':{'x':'196',
  'y':'0', 'x2':'1724', 'y2':'1280', 'w':'1528', 'h':'1280'},
 'level':'3', 'image':'/uploads/content/images/0/0/78/5cd964e9d35051.42858447.jpg',
  'canCrop':true, 'jcropConfig':[], 'pluploadConfig':{'runtimes':'html5, flash, silverlight, html4',
  'url':'/ard/article/coverUpload',
  'flash_swf_url':'http://rawgithub.com/moxiecode/moxie/master/bin/flash/Moxie.cdn.swf',
  'silverlight_xap_url':'http://rawgithub.com/moxiecode/moxie/master/bin/silverlight/Moxie.cdn.xap',
  'filters':{'max_file_size':'5368709120',
  'mime_types':[{'title':'Image files',
  'extensions':'jpg, jpeg, png, gif'}]},
 'chunk_size':'5368709120',
  'unique_names':true, 'multipart':true, 'language':'ru'},
 'uploadUrl':'/ard/article/coverUpload'});

Search result

\ard\modules\blog\BlogModule.php:
   14      public $mainPostCategory;
   15      public $minSize           = 0;
   16:     public $maxSize           = 5368709120;
   17      public $maxFiles          = 1;
   18      public $allowedExtensions = 'jpg,jpeg,png,gif';

\ard\modules\news\NewsModule.php:
   19      public $allowedExtensions = 'jpg,jpeg,png,gif';
   20      public $minSize           = 0;
   21:     public $maxSize           = 5368709120;
   22      public $maxFiles          = 1;   
   23      public $rssCount          = 10;

\ard\modules\publishing\PublishingModule.php:
   19      public $allowedExtensions = 'jpg,jpeg,png,gif';
   20      public $minSize           = 0;
   21:     public $maxSize           = 5368709120;
   22      public $maxFiles          = 1;
   23      public $perPage           = 10;

\ard\modules\user\UserModule.php:
   66  
   67      public $minSize                         = 0;
   68:     public $maxSize                         = 5368709120;
   69      public $allowedImagesExtensions         = 'jpg,jpeg,png,gif';
   70  

\ard\modules\user\widgets\UserCoverInput.php:
   34      const EXTENSIONS                        = 'jpg,jpeg,png,gif';
   35  
   36:     const MAX_SIZE                          = '5368709120';
   37  
   38:     const MAX_CHUNK_SIZE                    = '5368709120';
   39  
   40  

\ard\modules\yupe\components\behaviors\ImageUploadBehavior.php:
   38       * Максимальный размер загружаемого изображения
   39       */
   40:     public $maxSize = 5368709120;
   41  
   42      /*

when loading through the admin panel, the same thing, when loading through the "redactor", the window shows the loading process, but after that it just stops.
Can you please tell me where to look, where this restriction can be?
If you know what's the matter but don't want to help for that, I'm ready to thank you financially.