Docs: add to known issues

[AlannaBurke]

Q:
I keep getting Warning: opendir(temporary://file_resup_temporary): Failed to open directory: "Drupal\Core\StreamWrapper\TemporaryStream::dir_opendir" call failed in Drupal\file_resup\Form\FileFormAlterBase::saveUpload() would it be possible to see if we have correct permissions for the tmp directory ?

A:
Sure enough, this has 2 pods running, and requests are sent round robin to each. So uploading files in chunks will lead to issues, where the temp directory is per pod.
You will need to change the temp directory to be a folder under a mounted network share.
e.g.
$settings['file_temp_path'] = "/app/web/sites/default/files/private/tmp";
If you nest the directory under private then Nginx will block direct access to the files by default.

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