First, you must define it in the parameter.php file :
$paramAttachementMaxSize ( = '2097152' by defaut = 2Mo)
It is the limit you can define on your own.

But there may also exist a limit defined on your php server :
upload_max_filesize is defined in the php.ini.
This limit may be fixed by your provider without any possibility to change it. All depends on the provider.

Thank you very much!
One more time I am very impressed with your support!

Regards,
Evgueni

We have done it, restarted server, clear cache, etc. but still error coming up:
File size exeeds the limit of 2097152 bytes ($paramAttachementMaxSize)

Regards,
Evgueni

Ok found it in another directory as well - now it works!
Thank you!

Hi,

How did you do it ? Because i changed the $paramAttachementMaxSize from 2097152 to 209715200 and i still have the error File size exeeds the limit of 209715200 bytes ($paramAttachementMaxSize)

I modified the /projetctoria/files/config/parameters.php

php.ini is set at 10M

Search for $paramAttachementMaxSize in all directories and replace value everywhere you found it... We have changed to double size.

Thank you !

Just to complete the asnwers :
look in /tools/parametersLocation.php : here is defined the parameters.php that is really used.
It may not be the default one, placed in /files/config, depending on parameters you defined in the configuration screen