Here's how you can use cPanel to change the PHP upload limit for your cPanel account.

From your client area go to:

Services -> My Services -> click on the green "Active" button -> Login to cPanel/Control Panel

In the account Dashboard, click cPanel Admin.

In the cPanel Home page, in the Software section, click Select PHP Version.

In the cPanel PHP Selector | extensions page, in the upper right corner click Switch To PHP Options.

In the cPanel PHP Selector | options page, click the value for upload_max_filesize, choose a new value from the menu and then click Apply.

Click the value for post_max_size, choose a new value from the menu and then click Apply.

Click Save.

More info:

Setting an upload limit means it won't be rejected by the server based on file size, but doesn't guarantee an upload will complete. An upload might fail due to browser timeouts from slow upload speeds, or from maxing out your account resources.