Change record status: 
Project: 
Introduced in branch: 
8.x-5.x
Introduced in version: 
8.x-5.0-rc16
Description: 

Webform uses a temporary directory to build submission exports during a batch process.

By default the site's temporary directory (often /tmp) is used, but on sites hosted on multiple web servers behind a load-balancer that share a database and files directory, but that have discrete temporary:// directories, that method is unreliable between requests.

It is now possible to configure a custom directory to build submission exports, at /admin/structure/webform/config/exporters. This allows users of multi-server setups to use a directory that is persistent between requests to build the exported file.

Impacts: 
Site builders, administrators, editors