Batch operations doesn't create the export file on file system

I faced the similar issue,and even log shows that file can't be copied from tmp folder to public/private folder. But looking at the code I found that it's the generic error message that is shown when file can't be created. In my case the issue was the file name format, I was adding timestamp token at the end and it has spaces. Removing that I was able to create the file.

We had a similar issue to #5 where a non-admin user could not download an export in the private files directory, which we fixed by implementing a separate hook in one of our custom modules. I wonder if the regex is overcomplicating things? We are using $file->getOwnerId() to determine who created the export.

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Session\AccountInterface;
use Drupal\file\FileInterface;

function MYMODULE_file_access(FileInterface $file, $operation, AccountInterface $account) {
  // Allow access to temporary private file exports.
  if ($operation === 'download' && $file->isTemporary() && str_contains($file->getFileUri(), '://views_data_export/')) {
    if ($file->getOwnerId() === $account->id()) {
      return AccessResult::allowed();
    }
  }
  return AccessResult::neutral();
}

Hello guess.
How can you think its really possible to place exported file in file system?

I choose filename

Change export method to Batch

But nothing happen. This Initializing line doesn't grow.