Expedition uses APACHE as a web server and PHP as module for the scripts. By default PHP allow users to upload files with a maximum size of 2M, this can be updated by changing the PHP.ini
sudo vi /etc/php/7.0/apache2/php.ini
go to line where this variable is defined
upload_max_filesize = 2M
and replace by
upload_max_filesize = 250M
There is another parameter within that file can be increased to allow you use the multiedit with a big amount of rules
sudo vi /etc/php/7.0/apache2/php.ini
go to line where this variable is defined
post_max_size = 8M
and replace by
post_max_size = 128M
Increase the values to those variables and restart apache for the changes take effect.
sudo systemctl restart apache2