php-fpm UPLOAD_MAX_FILESIZE environment variable is unused.

[psy0rz]

The variable is created in the Dockerfile, see:

https://github.com/magento/magento-cloud-docker/blob/develop/images/php/8.3-fpm/Dockerfile#L21

But it's nowhere to be found in the actual config files. In fact, upload_max_filesize is actually the default 2MB when looking at the phpinfo() output.