+1 Chris_W

also if you want to divy it up between domains and give one domain more than another you can do so in phpini see here

https://developers.oxwall.com/forum/topic/47341

If your host does not allow you to have your own php ini per domain then you can set it in htaccess like so

php_value upload_max_filesize 25M
php_value post_max_size 25M

you can do the same with memory limit as well, php.ini or htaccess

where do we find this ..

the htaccess is in your oxwall root and the php.ini needs to be created if not already done by your host (should be in the oxwall root as well).  You need to ask your host first if they allow per domain php.ini files, if they do then you can just create a file named php.ini  in your oxwall root and put the commands in there.

You may also have access to edit your main php.ini on the server if they allow you to do that, most shared hosts dont.