Sometimes you have a form or a drop box on your site for users to upload pictures, files, etc. and they're larger than what's considered 'normal' (8M is standard). You can adjust this setting in cPanel, This can be changed via the cPanel >MultiPHP INI Editor
You’ll want to change the max upload size and max post size to 32M for 32 megabytes. I think 32M or 64M is a good value here.
And don't forget to hit APPLY after changing the settings.