The price list is not updated, hangs in the cache?

Question

1C-Bitrix

Good afternoon!
I ran into a caching problem, I’ll explain, now from 1s every day a price list is uploaded to the site, it is updated on FTP, BUT! the browser saves the old price in the cache and, accordingly, if you download the price, then the old one is downloaded.
I did not find a lot of information on the Internet, the only attempt, in the form of such a code:

<FilesMatch ".(pdf|xlsx)$">
Header unset Cache-Control
</FilesMatch>

Which, as it turned out, does not work, the old one is still being downloaded.
Can you please tell me if there are more special entries in .htaccess?
Thanks to

Answer 1

What web server is running on port 80?

<FilesMatch ".(pdf|xlsx|xls)$">
Header unset Cache-Control
</FilesMatch>