CPanel

The cPanel & WHM Log Files

https://docs.cpanel.net/knowledge-base/cpanel-product/the-cpanel-log-files/

File Manager

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If you don't have direct access to the underlying server of the website but you have access to cPanel, you can use cPanel to access the website files (i.e. public_html, .htaccess (if it's apache), plugins, themes, wp-admin directory, etc.).

1. . Login to cPanel
2. . Go to File Manager.

How to set Expires Headers for Your Site on cPanel

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https://support.cpanel.net/hc/en-us/articles/1500008232181-How-to-set-Expires-Headers-for-Your-Site-on-cPanel