java - Why do i see empty files in Intent.ACTION_PICK? -

when start new intent this:

intent intent = new intent(intent.action_pick, mediastore.images.media.external_content_uri); startactivityforresult(intent, request_code_load_main_image); 

i see empty files deleted before using method:

public static void deleterecursive(documentfile fileordirectory) {     if (fileordirectory.isdirectory()) {         (documentfile child : fileordirectory.listfiles()) {             deleterecursive(child);         }     }     fileordirectory.delete(); } 

i can't see them in normal file manager, in intent. files dissapear when reboot phone. normal or should remove files way? thank you.