通过在浏览器中打开文件链接，仅从URL访问文件，而不是直接访问文件

I have 2 hostings in one account with GoDaddy.

One hosting I use for my Wordpress website, and second hosting I use to keep my files related to website, to increase speed or performance.

But for the files in second account, I want to access only if request came from my first hosting or the website.

I searched couple of websites, and they suggested me that by using htaccess I can make it happen. But unfortunately none of them working. Some examples I am mentioning below.

RewriteEngine on
RewriteCond %{HTTP_REFERER}!^https://thefreetools.com [NC]
RewriteCond %{HTTP_REFERER}!^http://www.thefreetools.com [NC]
RewriteRule .*\.(jpg¦zip¦js¦txt)$ - [F,NC]


RewriteEngine on
RewriteCond %{HTTP_REFERER} !^https://(www\.)?thefreetools[NC] 
RewriteCond %{HTTP_REFERER} !^https://(www\.)?thefreetools.*$ [NC] 
RewriteRule \.(gif|zip|png|js|css|bmp|exe|rar)$ https://thefreetools.com[R,L]

Or can I make it happen by manuplating DNS records of my GoDaddy Hosting.

PLEASE NOTE :- I AM USING SSL ON MY WEBSITE, SO URL STARTS WITH HTTPS