Getting File could not be copied error while replacing a exsting pdf file

Hi,

Im getting the below error while replacing a existing pdf with the new one.

File 'temporary://sample.pdf' ('/tmp/sample.pdf') could not be copied because it does not exist. in
Drupal\Core\File\FileSystem->prepareDestination() (line 456 of core/lib/Drupal/Core/File/FileSystem.php).

The temporary folder path configured in settings.php is $settings['file_temp_path'] = '/tmp'; and I can see the temporary folder path in admin/config/media/file-system is "/tmp".

This configurations seems to work perfectly on staging but not in Prod. No permissions issues also. Pleas help.

Thanks in advance.