Why is Fileinput empty when editing a kartik-v form?

Question

Yii

I think many are familiar with the
demos.krajee.com/widget-details/fileinput
plugin , these are the settings

"pluginOptions"=>[ 
  "initialPreview"=> [
    0=> string(78) "/files/tenderInformation/test/file/Сущность_Блиц_оценка.xlsx" 
  ]	
  "initialPreviewAsData"=> true 
  "initialCaption"=> "Сущность_Блиц_оценка.xlsx"
  "initialPreviewConfig"=> [
    0=> [
      "caption"=> "Сущность_Блиц_оценка.xlsx" 
      "size"=> 8888 
      "key"=> int(19)
    ] 
  ]
  "overwriteInitial"=>false
]

and if when creating everything is ok. So if the file was loaded, then the validation shows that the file is not loaded and the FILES array with an empty file, why?